Hi DEO, welcome
I've been retired 8 years. It's been ok for me, even with bipolar, depression, dysthymia and past anxiety that I conquered (more on anxiety later). What I've realised over the years and with 4 major long term relationships, is that you either have a passion or you dont. It's ok for some including me to suggest a hobby or follow a footy team but if it isnt a passion you wont do it for long. What is a passion? Well a passion is inground from childhood, something that kids followed with their natural desire to obsessive levels. Those without a passion cant understand those with one.
There can be a possibility of joining a loved one with a passion. EG I wanted a large slot car set and my wife suggested she do the landscaping/build buildings and paint the scenery. That allowed me to integrate two train sets also into the project. It's proven a good hobby for both of us and apart from initial start up costs it is a cheap interest unlike many sports and other hobbies.
I'm not greatly experienced with social anxiety, however general anxiety or work related anxiety I have history. It took me 2 decades to eliminate anxiety. This included a cocktail of actions and I had felt improvement in the first 2 years. Better for me to list links to these experiences.
The following one centres on our nature and that was written with the view that we are limited on how far we can change to combat an illness. So please dont aim too high for good results.
The next one includes links to youtube videos of Maharaji Prem Rawat. Not religion, and his videos are amazing.
Finally one on depression., the most relevant.
I hope they help. There is a comprehensive library when you use search but if there is other posts you'd like to read please repost and I'll find more or talk more.
P.S do you have any specific area that triggers your anxiety?