D&D 5E (2024) Is WOTC done publishing campaigns?

[Cergorach]

We have already played all of them except Strahd (and have no interest in that one).

Then your group is an extreme outlier. And not the pace of adventure releases WotC/Hasbro is aiming at in the first place.

There are so many great third party epic campaigns for 5e that if you are willing to go third party, you'll never have any issues with having played all the adventures ever again. If not, that's your problem.