Can you recommend some underrated or lesser-known bl dramas that are still really really good? I’ve already watched most of the popular ones so i don't have anythig to watch right now.

Maybe:

You could also change direction into movies, there are a lot of interesting BL movies, for example:

And maybe micro dramas:

And if you haven't watched it yet, try kiss x kiss x kiss BL episodes (playlist) on bilibili tv. It only has little plot and more kiss but my, they're all great. I watched more than once.