Yeah, I think the Exchange token is now good enough to be a long-term investment. However, if you still choose to hold COSS, then you must be more patient to keep holding. But, I'm not sure about this exchange.
If I personally prefer BNB and KCS. But for long-term investments I still choose Bitcoin.
but, if the COSS team still active to develop and promote their platform, i'm sure this coss will be a good choice for long term holding too
but if the OP confuse about this exchange better to sell a half then hold a half from his/her coss token