I'm sort of in the same boat as you, except I had a knee injury that made me stop. I feel like I've lost so much in terms of form and strength that it's hard to stay motivated.

I think the solution is to just have fun and don't worry about performance (it will come back eventually anyway). Just try to play around. If you can only do the easiest routes, you can you make them harder by giving yourself a challenge like skipping holds, playing elimination with a friend, or my new favorite, only using one leg.

You can take it as an opportunity to rebuild a solid foundation. I think we just have to stick with it and it will become just as rewarding as it used to be.