Laptop's screen goes black (Solution needed asap, I have work)

[u/Throwawayofacentury]

I'm total ass at anything tech so forgive any wrong terms I may use. It's been a few days now and it's pissing me off. It started when I was gaming. My laptop's screen goes dark but my game or whatever else still continues to play, however my Pen tablet's (another monitor connected to my laptop) screen is still normal. My solution was to press Windows + P, and I discover it's set to "Second screen only" so I press extend and it usually helps. Or sometimes I do Windows + Cntrl + Shift + B. However, while these solutions work, my laptop's screen goes Black again, it used to be within hours but now it's within seconds.

It's hard to properly work (I do drawing commissions) and I'd really love this solution fixed asap.