I use to have the habit of jumping from one project to another, which in turn had me have barely any work done. Don't get me wrong, I do envy those who manage to multitask and be able to get work done that way. I am currently working on two projects, but one is more of a secondary job since my graphic work on it won't be very animated (card game), but main one is more of a one-man job.
I found a method that helped me stay focused with my main project (visual novel SRPG), I'm not sure if it works mainly because of the nature of my game but it is working the way I want it to. My method involves my game being free of charge, that reduces the stress of having a commitment and be working at my own pace, but also being very transparent with where the game is going.
My game is unfinished but is available to download, I just update it in very small increments. I have roughly around 3-4 updates per week with irregular breaks in between, these updates would range from fixing a grammatical error, a typo to including a sprite in the game and having it appear where it needs to be. In all that procedure I keep it documented online for everyone to see, having it be out there gives me the illusion that people are invested into whatever I'm working, that gives me some incentive to keep me going. I'm not spammy about it, I post information on the update on my subreddit and itch.io devlog just to list the changes and keep track.
It's a basic work format but it seemed to work for me.