Buy Rust after Vac Bann?

I once played in Fortnite with something like Softaim but I wanted to play Rust as normal and I was Vac Banned, And my question is if I buy the game on another acc will I be banned again?

No, VAC bans are per account.

So can I buy it again and play again without any problems?

No, these are pro accounts

So just buy a new one and I can play without any problems?

Exactly

If you connect the two accounts with the same phone number, the new account will be banned immediately.

The answer is obvious from the context.

Exactly