Game is infinitely stuck on loading screen now

I can access the main menu but if I press play it just stays on the loading screen.

 basically I downloaded around 300 of ccs. i don't think its that though because if I take my mods folder out of sims 4 and replace it with a blank one, it still doesn't load. however the only thing I can think of is a really big building plot (if that would somehow affect loading)?

i tried restarting the game from a fresh save (so creating first sim) and it seems to work, at least the CAS does.