Hello Georgiansilver. I can empathise with this as I also gave up the folk clubs for many years (for medical reasons).

There are alternatives to singing, or at least skills that you can add onto it.

One, you could try a musical instrument. I'm with a drumming circle. We meet up once a week and perform regularly. Great fun! And it doesn't require much musical talent beyond an ablity to listen and pick out the rhythm. We play the djembe. I'm also learning to play the guitar (but am lot further away from playing that in public).

Two, you could do a spoken work skill. I'm learning to be a storyteller. That's a lot of fun. I find it's not as stressful as singing, or as physically demanding.