My buddies and I started a out of shape dad’s bike club. We try to ride 1-2 times a week. I’ve made some good friends and the constant improvement of our riding skills makes everyone stick with it. No one wants to be that guy lagging behind. The group scenario makes everyone accountable and keeps you motivated. Check and see if there is a meetup or mtn biking club in your area. If there isn’t anything try and make one.