I do a combination of solitary things that are peaceful (and not too strenuous and if possible free of charge) and then try and do other things that are fun and social because when I get anxious it tends to make me feel withdrawn and a bit shut down, and I get far too caught up in negative navel gazing and very easily get to a point where i start to avoid people.
After some experimenting I think now have a good balance, and feel much better for it.
I do half an hour each day of Tai Chi (which I am learning from a free video series on UTube) . Then I do an hour or so in the garden usually twice a week. I also do a 5km walk once per week where I just walk and take my time to notice wildflowers, changes in the countryside, new crops in the fields etc. Those are my main solitary activities.
On the social side I do a dance class (mixture of line dancing and modern ballroom) once a week (the combination of great music and movement really makes me feel energised) and then I also go to my local cafe once a week for a meet up with other ladies from my village. We are a crazy mixture of nationalities (English, Spanish/Catalan, French, Colombian and German) so we all have a laugh teaching each other bits of our own languages whilst we chat. Now when I get anxious at least I can say f* it in 5 different languages which in itself makes me laugh 😃
OP I feel for you. Anxiety can be so difficult to cope with and overcome. I just hope you can find, with a bit of trial and error, a combination that really helps you.