@nocnoc
I tried and failed. In my experience it’s the start of the end. Sorry. Once these types are included the one they are trying to edge out is fucked. Excuse my language. The only thing you can try (although I tried this and it didn’t work for me) is to start booking one to one things. Make individual friendships with the ones you like in the group. Also, do not be provoked. I was eventually provoked after months of being excluded and then one day excluded publically on Facebook I blew up in hurt and upset and that was it. Totally dumped. My advice would be to withdraw completely from social media right now. Just say you’re having a media break (so you don’t see anything that can hurt you). Invite one on one. Do not mention the other person at all. Don’t respond to any messages that person sends. If you become aware of being excluded from something the response is “hope you had a lovely time” then go punch a pillow. Sweetness and light at all times. Now start building other friendships. Join a book group. Other groups. Start filling your time. Evening class. Bumble for friendships. You now need to be proactive rather than reactive.
Same. A woman who was an absolute vacuum, only switched on her niceness for people above her who could validate her, and was sort of benevolently distant to people she deemed beneath her, gave me the cold shoulder at work. Nobody noticed

She was so la la la tinkly laugh to everybody else, that nobody noticed that the only things she ever said to me were to correct me or to act shocked as though I'd said something offensive or risky or rude (which I never had).
I blew up one day too.
What I should have done was tackled it early on and said with a couple of witnesses ''Regina, I feel like you're so friendly to everybody and so cold to me, is that your intention?'' and the likelihood is that they are cowards and they back down and say ''oh gosh no'' and then you have to take them at their word and smile calmly and say ''so glad to hear it''. Apparently it puts them on notice that you're less conflict averse than they'd had you pegged for.
If by any chance they say '''yeh, it is my intention'' you say ''well, you're not obliged to let people know that you don't like them! you could keep that to yourself!''.
Luckily the woman who manipulated the social dynamic around us so that I was excluded left and everything improved instantly. There is a really inclusive mindset at work now. Whenever anybody new starts it's just uncomplicated welcome.