How to decide whether to let go of something to focus on recovery

I'm sitting on a decision that I'm having lots of trouble making and I need to make very soon. I'm hoping someone might be able to share how they've managed to work through a similar thing maybe with study, work, friends etc.

I'm part of an program that starts for the year again soon. It has heaps of pros about it - it gives me a chance to give back, i get a sense of purpose, it's meaningful, fun, a source of connection, it's one of very few things I have left from before everything exploded... the list goes on.

The cons though are that it can be stressful and emotionally taxing sometimes. It's a minimal time commitment but it can be physically tiring too. Starting it but not finishing could let people down. Etc.

This afternoon I thought I had made my decision, which was to not go ahead with it and take this opportunity to really focus on getting to a point where I'm feeling better, but then I went to make the call and couldn't do it. The idea of losing another thing right now feels scary and I worry that it will have the effect of a bit of a crash. I'll feel like I've failed at something else. But the idea of adding anything more right now to my life which is feeling kind of like a delicate balancing act, is just as scary. I feel that being part of this could go either way.

I'm a bit stuck right now and any ideas on how to make this call would be really appreciated. Thanks