Motivation can be difficult. There's another thread that mentioned setting short term goals. The rider mentioned riding to each neighboring state during the year as an intermediate goal. That doesn't have to be your goal. It's just an example.

A couple of things have helped me. Every year I start a new log in a spreadsheet. Running weekly sums gives me a feeling of accomplishment. Of course there are good weeks and slower weeks. Don't beat yourself up about the slower weeks. Just keep going.

Something else that has helped me that last couple of years is blogging about some of my better rides. Nothing fancy just a photo blog in the bloggers subforum here. But it kept me motivated to get out each week. It also motivated me to look for new rides every once in a while.