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You might want to look at Coping Strategies for the Serial Project Hoarder [0]. It's a blog post by Simon Willison who maintains a lot of projects. Even if you have only one, I think his strategies apply well to making progress regardless of whether you can work on your project everyday, or only once every couple of weekends.

That page also made it to HN in 2022 [1].

[0] https://simonwillison.net/2022/Nov/26/productivity/

[1] https://news.ycombinator.com/item?id=33762438

Edit: add HN link.

I like Apple Notes for planning

The best tool for that is discipline. Very difficult to learn tho. But seriously, many tools do the work (lets say, obsidian) if you do the most important thing that is to be consistent