Thank you @sue417 for sharing this resource it is a pretty great book. Mayo came out with one last year that they actually recruited a few members to interview right off of this forum, but it is skewed to BC survivorship.
https://mcpress.mayoclinic.org/product/beyond-breast-cancer/
Like you, I had no survivorship care, I was in my 30s and the one support group they had locally met when I was at work.
I met a couple other young patients the year of my treatment and we started our own informal meetings. It was born out of a need for an evening meeting. Those meetings continue today and I am still invited even though none of the original folks go anymore. They always send me an invite, and even ask me to come specifically now and then, and I do. I guess there is a little wisdom gained from all of this time since diagnosis.
Do you ever just meet up with other patients or survivors?