It's great to have a plan for your next couple cards, so well done. What's nice about the Venture X is that you have 6 months for the MSR, so it can be your miscellaneous card. And there's no telling when the Venture X offer will go away.
Make sure to read up on the MDD if you go that route. There is very specific application timing in order to get it right.
Can't recall when you are planning your trip, but if Delta points are the goal, I'd just make sure you allow time to earn the points and then book, especially if it's a high demand flight.
I was just reading today that a huge travel boon is expected here in 2022, and I'd assume 2023. I'm personally starting to plot out my 2023 plans so I can book flights when they open, etc.