Your first bike should fall well short of 7k.
There are lots of yz250f for sale ‘10-‘14 for 2,300-3,000 that’s where I would send you. Reliable motor, good resale if you find you don’t like riding (weird I know, but it happens)
Pick one that has a maint history you can document, or just looks super clean and owned by someone who appears cognizant and capable. Power isn’t too much to scare you, but you can use it easily and pull you around without a struggle. Don’t ride without helmet and moto boots even cheap ones are better than no ankle protection.
Good luck!