I don't want to work with people who've excluded me from their group
Why do think the group has been excluding you?
They haven't invited me to events in a long time and they don't ask me to do things with them.
It's rude of them to exclude you from what they do and it's understandable that you wouldn't want to do business with them anymore. Maybe you can have a conversation with one of them and figure out what is going on.
No, I'm going to find someone else to do it.
I think that this is something that you have to do on your own. I think that it is important that you let them know that it is is rude to exclude people.