I also have a list of ideas, with hundreds of entries on it. As I've gotten older, the amount of time I can put into one without becoming demotivated seems to have increased. Used to be a weekend, but now I can now put ~2 months into one without knowing if anyone is interested in it.
To keep going past that limit, it helps if the idea has a shape such that a very simple version can be quickly released, but then extended. Once you have any minor traction at all, the external validation makes it way easier to remain motivated.