I think it's time to upgrade

I need some help on getting a new pc/parts and how to do it the best way. Since I was too young to young to get a job, I used my grandparent's PC for gaming. https://www.amazon.com/HP-Pavilion-23-b010-All-in-One-Desktop/dp/B009CQOXQA

I know it's not the best, but it was all I had. I'm now old enough to get a job at my local Publix, and I plan on saving up that money for clothes,games and a new PC. I think I need to upgrade my PC because while the games I can run are fun, I can't run any AAA titles.

Can someone help me with buying the parts? In terms of choosing the right ones. I have nothing else to buy with me only being 14 so I'm trying to get the best PC possible. I want to be able to run fresh, next-gen games on ultra at 60+ fps. I'm willing to spend 1k-1,500k.