From coingecko, there are 2 project that are already using the ticker AIC. so i f you want to use the same one, it is up to you.

https://www.coingecko.com/en/coins/ai-crypto

https://www.coingecko.com/en/coins/akaiito

But i think, you do have advantage as you are using this token as native token of your exchange. so you just need to maintain and increase your trading volume so traders will actually use your token. but do you require KYC at all levels of withdrawals?