Transpiration mostly occurring during light cycle releases moisture. Larger the canopy, the more you have to mitigate it.
Get a dehumidifier. There are no tricks or magic otherwise.
Increasing gas exchange with a larger, dryer room might be enough in some contexts. Exhausting outside may be helpful too -- but both of these depend on ambient conditions. If your local climate has high RH all you are doing is uselessly moving moisture around. If it is dryer ambient RH, then that will help lower rh in the tent.
growing in a larger open area might help too, but then if it is a photoperiod you have to move it into tent every night, which is a pain in the ass better avoided.
if rh is too high, get a dehum.