which threshold are you trying to change ? These percentages are there for a reason. If you are getting some warnings then I believe addressing those or contacting support will be a better option.
I kinda guessed that . Believe me, you don't want to mess with those without support's intervention. It's not that you cannot change them. Ofcourse you can, you paid for it after all . Point is, support can help you determine how much to change and if there is some scope of handling the capacity instead of changing the warning.
Infact changing these is any way temporary till the time the capacity is tamed.