Then there is the hitchhiking option. I was dubious, but turned out to be a blast. If you've got a backpack and you are near a recognized trailhead, folks get what you are up to and are super friendly. Not only do they give you a ride, they also tell you about great hikes. In fact, my upcoming Labor Day backpacking trip is planned in part around a tip someone gave me when driving me and a friend back to the Onion Valley TH, from Independence, at the conclusion of my own thru hike (from Onion Valley to Whitney). Someone else gave us a ride from Whitney TH, where I put out a thumb, to Lone Pine; a friend drove us from Lone Pine to Independence, though we could have easily thumbed or, I think, grabbed a bus; and then the thumb worked its magic to get us from Independence to Onion Valley TH. And yes, this was the first time in my several decades that I gave this a shot.
So I am dubious no more. Now I pay it back when I can (recently gave some thru hikers a lift in Yosemite).