recommend some hobbies frands. (If you gonna say read, walk, sleep, draw or anything super generic stay away😟)

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I'm 19 and

In the past, I got very invested in building drone so I wanted to challenge myself and build one without google or ai or anything, just reverse engineering. now it's done and I'm bored.

So recommend some hobby which is challenging and trackable you know.

Give some idea, oh i can spend 1hr a day on it.