Heard a screech after turning on car and popped hood to see this have been fighting it back in but won’t go further than this

You need to loosen the belt tensioner first, then you can get that bolt back in.

Get the bolt bottomed out but NOT TORQUED, then adjust belt tension, once belt tension is set torque that one bolt on the alternator to 48 ft/lbs.

Usually what happens is a shop will need to adjust tension on the belt, they need to loosen that alternator bolt so it can pivot and they forget to retorque it when done OR they didn't actually use a torque wrench and instead decided to eyeball it but their eyeballs are a sh!tty gauge of torque.

I might have already pushed the bolt in pretty far, it’s not all the way in but it’s in there

Trust me it will go ALL THE WAY IN but you definitely need to loosen the tension on the belt to get it in. If you're concerned about getting the belt tight again when done then just count the turns on the bolt and back it off like 5 full turns. Then get the bolt in properly but not torqued, then tighten up the tensioner the same 5 turns you loosened it, then retorque the alternator bolt.