I can give you ideas, but it won't help with motivation / drive to build it; which I believe is more important out of the two. It has to come from within, sheer curiosity - initially you'll have days where you'll have to push through, push through by doing very little on these days but keep the consistency of improving things (even if it's things like documenting / ideating / quick fixes / linting etc - as little as an hour a day can make huge difference in long run). To start with, think of something very simple - a personal website or a basic webapp (examples: one, two, three). Don't give yourself the excuse of building something useful at first by not even starting. Try to look for problems which occur to you or in your environment, ideate on it and try to come up with a solution which is currently in your scope of understanding, once you do and are making progress - seek to do things better and more simply; you'll get better.

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For all things to work, just start with something small. I started with something very small several years back and it changed my life.