I am fortunate that I can think of ideas pretty quickly but I get overwhelmed with what tech to use. If you can just standardize on a platform you know, set your ego aside and use that. You can always iterate a working project but you can't do anything with unfinished work.

If you want to learn new, shiny tech, do small proof of concept projects and consider if they bring any value to what you've already built with what you already know.

Aside from that... you just have to do the work!

A book I've really enjoyed for my motivation across not only work and side project but also life in general is The Obstacle is the Way by Ryan Holiday: https://www.amazon.com/Obstacle-Way-Timeless-Turning-Triumph...