[SkyMarshal]

>and then sometime I find myself I haven't looked at that project in the last two days as I spent it by browsing random projects on the internet, working on other things, watching multiple seasons of sitcoms or just brainstorming about product ideas that I can build in future!

Start by cutting out the truly wasteful things, like watching TV. Throw your TV in the trash (seriously), or first thing every morning get out of the house and go work in a library or coffee shop for five hours or so.

The other things you mention are part of the creative process - browsing other projects on github or wherever for ideas, brainstorming, working on other projects (eg decluttering your todo list).

If you break your main project down into component parts and estimate it, that will give you some baseline/benchmark as to the rate of progress you should be making on it. Assume a 9-5 workday and no more than 5hrs of actual work on the project per day. If you're roughly keeping up with that by working odd irregular hours (16hr sprints, 2 days off, etc), then you're in good shape. Otherwise it will give you an idea of how much more you need to reallocate to your main project.