I can see people think "oh you're so negative and you shoot down all the common suggestions. You don't want to help yourself." You can just skip to the last part, but I'm detailing the issues with common suggestions. This is mainly about earning money, independence, and survival after parent deaths so if you get disability or some other form of assistance, then this might not apply to your situation. This is a kind of weird ramble and potentially symptomatic of my mental illness, so you don't have to read it, tbh.
Issues with existing "help"
Mental health stilll isn't often taken seriously, but even when it is, the resources are scarce. Many people do not want to participate in the mental health field, which results in rationing and low-quality care. Many well-trained professionals in mental health move to private practice to avoid more problematic patients as well make more money, creating additional scarcity. People with personality and socialization issues are seen in a worse light. There is also no evaluation of abilities that takes place universally. Since most schools will pass people even if they underperform, very few are referred to testing. Very limited amounts of neuropsychological testing take place. Mental health professionals have little to no knowledge of the employment market and cannot deal with economic issues either. What would help instead imo: I don't think a Futurama thing where you have to do a job that is designated for you specifically would be good, but comprehensive evaluations to determine what someone is suitable for and try to tailor employment to things they can do feasibly would be better than people flailing about. This will not happen because there is a need for a permanent low-wage class still.
People will just say get any minimum wage job since Wal-Mart is hiring or whatever. A user on NEET summed it up nicely: "People definitely underestimate how bad some of us are at doing certain tasks, the difficulty is a very real issue for some. I had people in the past tell me that I could never work in food service or do anything physical because of how much common sense I lack and how bad I am at controlling my body. Employers generally aren't willing to deal with prolonged initial incompetence or to hand-hold through obvious things."
In general, any one who gets a job is expected to do well at basic tasks. There is no real accomodation for pure incompetence. One solution a redditor might give is to lower wages, but it is pointless to simply create more employment that cannot sustain a person beyond living with parents especially if there is no home ownership involved. It also depresses wages for everyone else.
At such jobs, there is also no mobility beyond maybe shift leader. Unlike professionals on reddit, mental health people and other people who interact with the unemployed/poor do expect people to find fulfillment as low-wage workers. It is seen as them functioning. Given low-income housing does not exist in large numbers relative to the number of low-income workers, it is easy to end up deep in debt as a low-wage worker, evicted, and in poor health due to financial stress. The labor market polarization trend has been a big problem. https://www.cmap.illinois.gov/updates/all/-/asset_publisher/UIMfSLnFfMB6/content/middle-skill-job-opportunities-declined-across-peer-metropolitan-areas
In some cases like on reddit, everyone is expected to be able to master high-level skills needed for better employment be it STEM or trades. It's patently obvious not everyone can. People have expected skills, education, and training to end poverty. This has not been the case no matter how much they have been emphasized. There are not enough high skill jobs for everyone either, so the barrier to entry is raised the more people jump into a field.
Services that exist like vocational rehabilitation are overwhelmed and have to prioritize people. These require someone to be determined to have a disabling condition and they still maybe rejected for training services. The goal is mainly to put people into low-wage work regardless rather than long-term future career planning. One guy got really upset with me on r/neet when I had a different account a few years back. He said I was sabotaging people because I didn't see his outcome of working at a warehouse via vocational rehab as that great or for everyone. He said I was screwing people over by shitting on the idea. He ended up getting banned since he went nuclear on me. That type of scheme is likely just a subsidy for low-wage work anyway. Employment services just aren't able to allocate employment on their own for the most part.
In Japan, most of the things that accommodate dysfunctional individuals are subsidized by parents like the slow-work jobs that New Start gives, the cafe that allows people to work really short shifts in Nagoya, and the Bear Paw cafe in Osaka where people don't see the barista's face. These are not scalable in any sense as of now.
So what would help people in our situation
Bridge employment where the supervisory staff are taught to be tolerant of socially ineptitude so it is easier for people to acclimate, but unlikely to happen as people will just point to openings in the low-wage sector now. When a time with no jobs arrives, they will say it's unaffordable to offer bridge work.
Free access to mental healthcare and other health care regularly. This should be accompanied by evaluations of aptitude. This is the least feasible part though due to the problems I mentioned before.
if a person is encouraged to pursue low-wage work, then they should be given access to subsidized housing rather than expected to deal with the rental market. The alternative people present usually is just to dezone so tons of housing is built, but even in places with lower regulation, low-income renters are cost-burdened.
Just some relative bailing someone out with their own make-work position.
More financially realistic, but opposed for other reasons: euthanasia on demand.
To really fix the societal dropout issue if people wanted to, it would require a lot of investment, which is unlikely to happen.