Did you have problems with motivation or feeling that the project was too daunting? Or was it natural? Some projects I wanted to do I just stopped because I wasn't getting anywhere and felt like someone possibly did it better before (though I don't think anybody did something similar to what you did there) and I just quit it. Do you have any method to overcome such dead ends or negative mindsets?
Nah, it is not about motivation, it is always and only about spare time. Family and job obviously have priority.
When I stuck or tired due to lack of progress I just take a break from the project for a day, week or even month. I have noticed when I get back to that fresh, something good happens straight away, new ideas are popping up, things start to spin :)