You sorta motivated me to pick up guitar again... the sound of it makes me excited so gonna cont. with a course I bought on Udemy and see how far that takes me.
I'd also checkout Samurai guitarist and Paul Davids.
Solve a problem for yourself! Ideas are in our everyday lives - look closely, those things/services/tools you 'wish' could exist, you just might spot a niche - then build it for 'you', and you'll realise how many people needs this product/tools/services!