I also have/had mild social anxiety. When things open up go stay for a couple days in a hostel somewhere (use hostelworld), make sure to find one with a reasonably large common room and be in it, read a book or do some work. It will probably be therapeutic. Not much is forced and socialness tends to just happen. If someone sits near you or says hi ask "Where are you from? How long are you here? What have you done here?" and roll with it. If you do some research on whats in the area or cool food you want to try, you have an immediate opportunity to invite someone to do an activity. It will feel like sitting on an airplane with the door open to go sky diving to you, exhilirating if you manage to make yourself do it.