Sims 3 game stuck on black screen

@Leeya2024  What kind of custom content are you working with: .package files, Sims3Packs, or both?  In case you're not aware, Sims3Packs, once installed through the launcher, they're bundled into .dbc files in Documents > Electronic Arts > The Sims 3 > Downloads.  The thing about these files is that the game reads them in numerical order, starting with dcdb0.dbc, and stops when a number is missing.  So if you removed dcdb1, dcdb2 and higher wouldn't load, meaning any broken cc in those files would have no impact on the game.  It makes troubleshooting somewhat more complicated.

Another detail to keep in mind is that some mods (not cc) depend on installed content and can crash the game if that content isn't loading.  For example, NRaas Cupcake requires the Bakery store set.

I'm not sure where you currently are in the process, but it might be worth rebuilding your user folder rather than pulling files out.  If you move or rename the Sims 3 folder in Documents > Electronic Arts, the game will create a new one the next time you open the launcher.  Then you can slowly add your cc to the new folder, testing along the way to see what works and what doesn't.  Once you're satisfied, you can transfer your saves and anything else you want to keep; here's a description of everything in the folder:

https://sims3.crinrict.com/en/2011/01/faq-user-files.html

If you're having trouble isolating a broken cc item within a .dbc file, I'd also suggest trying Method by Mell here:

https://sims3.crinrict.com/en/2011/01/tutorial-how-to-get-rid-of-unwanted-custom-content.html