Is There a Way to Get More Productivity?

I think it's an interesting idea but I don't know how to best implement it. It feels like you could fill your entire day up with productivity without being fatigued in the same way that you can do incremental reading and not be fatigued. Maybe it would work better in different fields like like encoding lots of tasks they have like interdependencies so you have to do something before you do something else. But theoretically if you had no hard deadlines and you just had a huge list of tasks and you reviewed those in a spaced manner right and you just said next if you don't want to do it and if you did you just did it right or made some progress you did something on it