Your first problem is to get 0.0002 ETH for gas fee, now you already got it, but when you want to swap your ARB, you can't because there's a minimum amount to swap ARB to ETH, correct?
No, he didn't got the ETH yet because/but what he get was ARB'ETH and this is the problem on why he still can't make a conversion.
1. Because it's different token, one address doesn't mean can only receive one token.
2. Find instant exchange that allow you to exchange small amount ARB to ETH.
3. Same to number 2.
1. If both of them are not the same, then why they do share the same addresses? One address does really mean that it can only receive one token and that is what happened to him.
2. I'm not affiliated with them but I've been using Fixedfloat for a long time now, or whenever I need to convert/send some cryptos like for example if I need a BNB coin to convert/send my BSC token, or if I need a TRX to send my USDT in Tron network. The fees there are only cheap and transactions are processed quickly. Lastly, they are legit of course.
3. Same with number 2 as well but before he can do that, he will need to solve his existing problem first.