I have about 1 btc in my account. I want to exchange it for eth. 20% off sale it is also possible.
Cryptocurrency transactions are Irreversible and therefore all transactions are considered final.
If you are willing to accept ecsrow (a third party receives bitcoins from you and then asks the other party to transfer ETH to you) then you may find interest.
Other than that, everyone will view it as a scam because it's (too good to be true) especially since your account doesn't contain any business history.