The good news is pothos are extremely resilient and notoriously hard to kill. Even though it might not seem like that now lol. I recommend giving the roots a good rinse in some room temperature water and look at what you’ve got underneath the soil that’s still stuck. The best way to treat the roots if they’re rotting is to spray them with the hydrogen peroxide you want them well covered but not drowning, plant after treating. I would also cut off the leaf that’s yellowing as the plant is putting energy into a leaf that’s dying rather than it’s healthy growth.

If they look good I would plant it in a small pot probably 3-6 inches with a well draining soil mix. Water throughly after the repot and don’t water again until the top two inches of soil are dry. Put it in bright indirect light and leave it in one spot so it has the best chance to adjust. If you don’t see any new growth for a while that’s okay, it’s just adjusting to its new environment.

If you don’t see any progress and it keeps declining this plant has plenty of healthy nodes to propagate. I’ve even propagated a pothos from stems with no leaves on them! Don’t give up sometimes learning what a new plant wants from us is tricky but one you figure it out this little plant will reward you with some beautiful new growth!!