We were supposed to be there now too. I canceled everything and now we're looking at April. Even if I could have gotten boosted and gotten my kids their second vax in time, with the crowd reports I'm seeing over at WDW, I wouldn't feel great about being in Orlando right now, and I was just there at the beginning of the month. I'm not saying the Spring break crowds for our rescheduled trip will be any better, but we'll be 3x vaxxed for adults and 2x vaxxed for kids by then, and that will be good enough for me.
OP, if you really want to go to a theme park right now that is outdoors/masked indoors, Animal Kingdom over at WDW might be your best bet. That's what we did on Dec 5. It wasn't risk-free because nothing is, but it felt reasonable for us because we only ate outdoors and masks were being enforced in shops and in queues. We used
Genie+ to get quickly through indoor lines/rides and spent a lot of time walking the animal trails. There are only 5 rides in that whole park online right now, so definitely not as exciting a day as teens might have at UO/IOA, but we made the best of it and the kids had a great time.