sims 4 crashes

@StephanieFrench  You can now copy over your save, or your main save, to the new Sims 4 folder.  Instead of clicking Resume, use Load Game and try loading your various households.  Keep track of which ones work and which don't.  For any that don't, move the sims to a different lot, preferably blank or with a default EA house on it—the point is to use a lot that is itself intact and working.  If the sims load on this new lot, they're fine; if they don't, split the household further until you figure out which sim is the problem.

Test the houses too, without the sims living in them.  If you can load the house in build mode, move in a newly-created sim (use the freerealestate cheat where necessary) and test again.  If the house is broken, start deleting one room at a time until you can play it, then quit without saving and go through the items in that room.  Here again, you're narrowing things down until you find the culprit, and you don't need to save your progress, just keep track of what you've done so you don't need to repeat yourself.

Since you're copying the save rather than moving it, you don't need to worry about the effects of your testing.  Your original save will be intact in the old folder when you're ready for it.  The idea is to have a list of what's broken so you can make those changes, and only those changes, in your main save.

If you find that something is broken and you can't fix it and don't want to lose it, let us know what it is, and maybe someone will have further ideas for how to address it.