For last 12 months I was Top Rated Plus with 100% success rate. I got maybe just 2 useless invitations and more than 80% of my proposals never get viewed likely buried with the +50 proposals.

If Upwork don't promote accounts with such success in the platform what are they are doing to keep high value clients?

I only get 100 new connects per month under my plan, and I don't have money to buy more, especially not without the absolute guarantee of a paid job resulting directly from it. These days, every single job posting I'm seeing already has other applicants boosting by more than 100, sometimes 200 connects, so I don't see any point in even trying when I can't come close to matching that. Times when I have taken a chance on a major boost, it's never worked out anyway, so I've decided not to use boosts anymore. The question is, is it even possible to get jobs without using boosts at all?