If it were maybe 15 years, I could very quickly identify some changes that would easily change the entire trajectory of my life.

At 10 years, it's hard to say since by today's perspective, I've had my life in reasonable order and heading in the right direction for the past decade. So there aren't a lot of options to make different choices I'm certain would help me gain things personally. That being said:

I would make a more concerted effort to leave the job I had in 2014. It was a regrettable decision to stay as long as I did and a very toxic work environment for me. I could have made more money almost anywhere else and by that point I had met all the important and amazing people that worked there during my reign, so I wouldn't have missed out on those friendships.

I do have much better employment skills than I had 10 years ago and most of what I know and do would still apply back then, so I guess I could make use of that to climb the ladder a bit faster and/or earn more money sooner in my career.

I suppose one day to day "exploit" would be that I'd know in advance if any specific purchase was a good decision or not. For instance, I'd know that the car I was going to buy ended up being a fantastic choice or that the piece of crap bookshelf was only going to last me a year before it started to disintegrate at which point I would have to replace it. This could be useful for saving money, since at the very least I could avoid purchasing the stuff that I know would not last or live up to expectations.

I did not have a lot of money back then and certainly not enough to make good use of any stock market foreknowledge from today turn into a big payday. I don't keep up with lottery numbers. I'm not a sports person, so I wouldn't / couldn't make any money off that kind of betting.

If I were motivated enough, I might try to teach myself some music / music production skills and then start releasing my own version of popular songs from the future that haven't been released yet. Maybe I'd luck out and end up with a lucrative music career! Or similarly, I might try to figure out the patenting process and then start patenting ideas for stuff that had not yet been invented, then do my best to become a bit of a patent troll.

There's a slim chance I could save the lives of some relatives, but honestly that's hard to know. I had one family member die suddenly of a heart attack and another that died of an accidental drug overdose. I also had a friend that ignored people's advice to go see a doctor and ended up the problem she was having was cancer, which she passed away from. Apparently, one of her doctors even told the family that if she had gotten treatment a little sooner, things could have turned out quite differently. We'd been telling her to go for at least a year, but if I could go back I would try a lot harder and be more persistent.