Chadd.org offers a nationwide listing of in-person ADHD support groups. If there’s not a CHADD group in your area, ask your therapist for local recommendations. It seems like in-person support groups are dwindling as more and more is offered online. I’m the parent of a child with ADHD and I get support from Facebook groups for similar parents. There are many Facebook groups for adults with ADHD too (ADDitude has one here: https://www.facebook.com/groups/36128962836/).
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism