What is your industry/profession? The best way I've found to find problems worth solving, is working literally anywhere else than "software development shops". Basically any profession/workplace out there is filled with various inefficiencies, but you cannot ask people to point it out themselves, you have to be there and experience it yourself to actually fully understand what the problem is and what a correct/good solution actually looks like. Otherwise you end up with the typical "faster horse" problem-solving.

Once you're there, with the mindset of improving things, you start noticing a ton of areas things could be improved. Then just use your best judgement and start thinking why/how/when.