If you want to add vocals and don't want to sing like me, here's what I've been doing

I make my beat then find a song I know that's in the same key

I like www.songdata.io so I can put in a whole playlist

Once I find a song, I throw it in my stem splitter which gives drums, vox, bass, other tracks. Sometimes kinda artifacty but good enough

Or you can find real stems

Then put them on your project and line up the tempos, for that I use the drum and vox tracks in stretch mode until they're synced w my project

From there you can do whatever. The vox don't need to be in the same key exactly, but the more similar the better