My Main Save Freezes the first couple of seconds of gameplay at the same time.

morganrighteous  Does this happen if you're playing a different house at the time?  Please test both in the same neighborhood and in an entirely different world.  If you can get past that time, go back to your original household a couple sim-hours later and try playing them forward.

You don't need to save your progress; this is just for testing.

It freezes at the same sim hour no matter what household I play unfortunately, it freezes exactly at 4:04am. 🤦‍♀️

morganrighteous  Do you have Eco Lifestyle installed, and if so, are inactive sims allowed to vote on Neighborhood Action Plans?  Maybe the game is freezing while trying to apply a NAP.

Separately, is there a new world that you didn't own the last time your save worked, and if so, can you play in that world past the 4:04 am stage?  The idea is, perhaps whatever is happening in your old worlds might not have spread to the new one yet.  Even if this does work, don't save your progress, or use "save as" so you don't overwrite the original save, in case the new world becomes affected too as you keep playing.