Another resource that’s helped me immensely: the book Laser-Sharp Focus: A No-Fluff Guide to Improved Concentration, Maximised Productivity and Fast-Track to Success by Joanna Jast.
This book guides the reader through setting up a “focus system” with a detailed roadmap, including lots of solutions for specific problems people tend to run in to.
There’s a lot of books in this space, but this is the one that’s really worked for me. Check it out.
Also try my free mini-course on a similar topic: