Idk what to do.I have a tank servant but people doesnt pt me in grind.So is switching to mins a good idea?
I don't think switching a class to another one is a good idea. I mean, you made a servant because you were attracted by its skills, right? And now you want to switch just so you can get partied more often?
Maybe if it's your only character and all you care about is getting parties, you could switch, but keep in mind you'll need to reset your stats and get different gear and xtals.
But in case you want to act as a tank in parties, I think servant can better keep hate than mins. Enrage and Soothe are good hate manipulators. Mins is not usually used as tank, tank gear on mins is used just to resist attacks since you need to be kinda close to the enemy to use songs.
Try finding an assassin as a grinding companion, or another class that's strong in attack but weak physically. Use soul connection on them and occasional heals and it should be a good combo. Or a pally, highness bless is good for lowering the HP drain caused by guardian.