There are many groups out there (my first thought is "MeetUp", where I found my kayaking groups) that you could join and do the occasional camping trip as a solo? Or - as a seasoned RVer, you could offer your services to newbies "We'll meet at the campground, and I'll help you set up your rig". Or maybe you could find another (male) kindred spirit who would love to go with you. You might not travel/camp as often as you would have done in the past, but there ARE ways to continue as a solo and still have people around who would help you in the event of a problem
(In MY case, Ed loves car auctions. He will fly off to a Barrett-Jackson event; I stay home, eat the pasta he dislikes, and watch chick-flicks. We each get some "me time" on our own agendas - and it never hurts to realize you actually miss the other person while they're gone)