Not really.
MK is suffering from something called "induced demand". It is a term you often hear with highway design.
The Reader's Digest version of what is happening is expanding the park by adding attractions will increase demand equal to or greater than the capacity added. You just end up back in the same place once the expansion is done.
The only real ways to contract that is to increase the demand at the other parks to drive traffic away from MK, increase the price to go to MK to lower demand, spread the crowds out more evenly inside of MK and/or increase the capacity of the existing attractions.
The first of those is in progress, the price to go to MK has gone up at least for single day tickets, Magic Bands have helped a little to spread out crowds, but increasing the capacity of existing attractions is just not that easy at MK.