maybe too fast again (lvl 75 within 3 weeks)
maybe vpn provider
well... PoE botting is not good for me

It's a matter of time

keep thinking what you did wrong, fix it, and go again !. 3 weeks for 75 is decent, 1 week is strange

I usually make up to 70 in 2 weeks or so, and i'm still going.
Make sure when you have get a different IP/VPShit provider, to create the account Under this IP, to avoid the region lock.
Configure your bot well enough to make it work 10000% without supervision (it's possible, trust me

), and if you're botting a little farm (less than 5 bots) make sure to have sort of "interactions" with other players, trade items with them, sell them things, uptrade currency to them etc etc... Human things sortof
Also, learn c# basics, it'll help you when you'll have to investigate issues in plugins
Else, you're good to bot again !