I do understand you. I had to go through all this in the past. I know how hard is.
And I do understand your struggle to afford a therapist and all.

I can tell you some of the advises my psychologist told me when my anxiety got the most of me. Of course, sure there are articles in gloogle and books more helpful. For example I have a book about social skills but it’s by two Spanish psychologist and I didn’t find a translation in English.

My psych used to tell me, when you feel blocked out, and need to keep a conversation, look around for clues, it will probably give you a topic to talk about.
I sometimes use this tip. For instance if you are in a bar, you could talk or ask about this or that bottle of liquor from the self. Or if there’s a pic, ask about it.

Sometimes, I invent an excuse to quit the place for some minutes (going to the restroom, or going out to make a call...) so I can breath and get rid a little of my pressure and think about what to say.

The best is to be present. Focus on what people are saying, this is when mindfulness makes sense.

Asking questions or ask the listener to tell you more about what (s)he has just told you, also help to vaseline a conversation and feel yourself more comfortable.

I’m listening to me while writing this to you and I think I’m giving the impression that I’m master or that I follow these tips very well and all it’s marvellous.
Don’t get this picture because I still suck at social abilities, still hard for me. I only try to do my best.