What are your interests? Yeah, besides programming. Do you play guitar? Are you a baseball stats geek? Do you like math puzzles? Pick a problem aligned with you

What are your interests? Yeah, besides programming. Do you play guitar? Are you a baseball stats geek? Do you like math puzzles? Pick a problem aligned with your other interests, and go for it. Whether you do this in a language you already know or a new language / framework / etc. is your call, but challenge yourself. Your interest will keep you going through the slow parts, whereas if you're just learning tech for its own sake, you might just start learning something else as soon as it gets hard. That can feel like progress, but doesn't usually add up until you stick with things for longer.