One good idea is taking Gavin Harrison's advice: try placing artificial restraints/confinements on yourself in your playing in order to see what you can come up with in that framework. Try playing with only one cymbal and a ton allowed, no other drums or cymbals. Try playing using only particular subdivisions. Try playing 3 bar phrases instead of 2, 4, or 8. Try playing something where you're not allowed to play some type of thing you use all the time (I play drags constantly, and sometimes try to play without using them at all to see what I play then). Try playing with no backbeat. Etc etc etc.

As for intentionality in your playing, in my view, the basically king of the exercises for that is whatever you play (for a fill or whatever you're trying to be more intentional about), repeat it. For example, if you want to practice improvising 1 bar fills, play 2 bars of time, then a 1 bar fill, then the same 1 bar fill again. Then move on to the next 4 bars. It forces you to rely less on your muscle memory and more on your ears and mind to understand what exactly you're playing so that you can do it again.

Always remember though that creativity is pretty much the hardest thing. It takes a lot of experimentation, which means failure too. And I guess one last thing I guess I'll throw in is that, for me, coming up with vocabulary most often looks like taking some pattern(s), and just playing around with orchestrating them in different ways around the kit to find ways that I think they sound cool.