Hopefully, if you only bought one 1080ti you are putting it to good use for other things as your regular video card.  Personally, I would keep on mining coins that interest you despite rather or not they are currently "profitable".  Bitcoin wasn't profitable for a various times but look at it now.  People who mined back in the day when it wasn't worth it are very happy.  Not that I advocate mining.  I'm just interested in cryptocurrency.