How to decrease my money farmed with car sales?

Unfortunately, no you cannot.

Theres no way to change it at the moment i do not think so

The only way that i know right now to dumb this down, is to play export missions (Stealing cars and selling them). A friend of mine got 730k for exporting 5 cars, simply change the values every time you get your paycheck to 1$ and it will look legit.

The only way I believe is to delete your character and create a new one, but you'll lose everything you've bought, missions, stats, etc.

Don't panic. Just keep selling cars from the street without using cheat engine and it's gonna be allright.

Who cares about getting banned anymore? Accounts can easily be made, and ip's can be changed with VPNs. I've already been banned once, and I'm back and playing as usual.

I just created a new account and deleted the old one. Is there a better way to get money instead of selling cars and modding the values? Can i change the money earned while heist'ing? (or is there a stat that doesnt show in the social club which can be modified and gives me a money advantage?)

You can sell cars for negative value. This should decrease the value shown.

Negative values? How does this work?