It helped for me to stay away from Smash news for a while, finding stuff to do.
I've been playing every single Smash (with the exception of 3DS) in preparation for the Ultimate release.
Last week I played 64, this week is Melee, next is Brawl, then 4, then it will already be the week for the launch where I will give a break so I don't get burnout in preparation.
I've also been trying to 100% Breath of the Wild and it's a good timewaster, if you have anything in your backlog that you need to clear, I recommend you do now because it's the perfect time to do so.
Also talking about 64, holy shit this game feels like a prototype going to Melee. Really barebones but still was immensely succesful to the point of kickstarting the Smash Bros franchise. Makes you wonder how a well executed idea will take you to.