My tip is—Take it slow and just enjooooooy. IDK what your other trips are like, but for me with a family of 4, 2 being kids, I simply cannot stop and take in all of what the parks have to offer very long. Who has to go to the bathroom? where are we going next? who's hungry...etc.
don't get me wrong, I love my family trips, but I cant just sit on a bench in a pavilion and bask in the details. I can't go where the wind takes me, be sporadic and lose myself in a particular land.
When I go solo, I'll spend much more time walking the Epcot pavilions, looking at all the little details, sit at a bar and try different regional drinks, talk to the CMs and hear their stories oftheir home towns.
IDK if you like photography, but when you are solo, you can scope out locations for taking pictures that are unique...wait for that perfect sunset or moment in the parade. Watching the parade through a lens for that perfect photo is much different than watching it for just enjoying the parade. Same goes for the animals at AK, spend some time waiting for the gorillas to move about and let you get that shot
Spend some time exploring the resorts. When with my kids, they prefer the parks, so taking the time and sitting on a rocking chair at Wilderness Lodge or Boardwalk and enjoying the atmosphere is rare.
A lot of tours are expensive and prohibitive if you are with a larger group, however as a solo, sometimes the price can be more manageable.