My partner before I knew him moved to SE from Belfast for a new job. He didn’t really know anyone here and family all in Northern Ireland or Scotland. The first proper friend he made was from posting up on here asking if anyone could show him the local trails (Surrey hills). That person became a good friend and had other lovely friends and since I met my partner they are some of my favourite people who we go on riding holidays with etc.
I also used to feel a bit lacking in a social scene before I met my partner and really got into riding. I joined my local mtb group and have loads of friends through that and have the opposite problem now of juggling all the potential events/invites. Weekly rides, dig days, weekend trips to Wales and pub meet ups to sit around and talk about bikes and riding. My non bikie friends tend to suffer a bit as it does take over rather.
One other thing I recently had quite a bit of spare time in the week to fill and was feeling a bit lost and aimless so started volunteering at the local rspca. Lots of nice people to chat to there and loads of lovely dogs to walk and cats to stroke. I come back feeling great from my weekly visit there.