Impossible goal idea

Hi! For my impossible goal, I’m thinking of going back to an old goal I’ve put in the back burner for a few years and knocking it completely out. But I would like your feedback on if it’s along the right lines and any ideas you have for planned meaningful fails during it.

About 4 years ago I made the goal to run a marathon in all 50 states before turning 50. I’ve done 14 and am 42. My goal idea is to plan 36 marathons for 2020. Obviously I wouldn’t be going for time, just completion. I am not sure if it’s better to keep procrastinating and perhaps forget it all together? Or just do a few over the next 8 years and make them memorable? Or seriously get a logistical plan for 36 and intend for them. Thoughts? Thanks!