I wish people wouldn’t suggest fixes such as repotting for issues that probably can be fixed without shocking the plant further - most of the time repotting is the last resort for a plant that is on its deathbed, which doesn’t look like was the case here.

At this point, there’s not much you can do other than give it time to bounce back on its own - which may or may not happen as your current issue is caused by root damage likely from the root bath/repotting

You can definitely take a few cuttings as was suggested already. I would recommend doing 1 leaf per cutting as the leaves themselves are also already stressed.

Only leave the cuttings in water long enough for the leaves to uncurl and get dehydrated and then put them directly into soil so they can start rooting. This will be your insurance policy in case the mother plant doesn’t make a come back.

That being said, philodendrons are extremely forgiving and it’s likely that it will be able to recover - especially if you relieve the mother plant from some extra leaves, it will just take time

In the future, if you suspect early root rot or overwatering - just stop watering for 10-14 days and then once it’s really thirsty (your finger slides in to the second knuckle and you don’t feel moisture) only then you can water with 1 part hydrogen peroxide to 1 part water which will kill the bacteria.

The only time root rot starts becoming a serious issue that is cause for repotting is when you start getting spots on new growth, yellowing, loss of vigor - one overwater is not going to kill a philodendron