First of all I would start therapy with a therapist specialized in social anxiety. CBT (Cognitive Behavioral Therapy) is very effective (personal experience).
Then, consider that all this situation due to the pandemic will slowly come to an end. At that point, what I suggest is going to Meetups. They saved my life when I relocated to a new city. I met so many people, I made new friends (real friends) and I overcame social anxiety (slowly, but I did!). If you consistently attend meetups, see a therapist and take care of yourself, you will meet new people, improve your social skills, overco