It's very rare to find those "scratch your own itch problems", the solution to that itch is most likely a google search away.
Pick a good product that you use and clone it. Keep an open mind because you can never copy the entire business since there is only so much you can see. Atleast you get some direction to start and you know that you are not trapped in building something people don't want.
Since you mentioned making your skillset strong(technical?), either way you win by just starting something.