"more often the case" is correct and usable in written English.
You can use it to describe a situation that occurs more frequently than usual. Example sentence: In most of these scenarios, the issue is resolved quickly, which is more often the case.
That seems more often the case than not.
But the opposite is more often the case: you're struggling to start with, then people knock you down further.
Finally, if you want to understand how things work – or, as is more often the case, how they don't – there are two good options.
On the other hand, when, as was more often the case, it was conservatives who were holding out, he had no influence at all.
When, as is more often the case, there is a considerable distance between the two sites, transport in hopper barges is more economical.
That tastes like roughly four hours too many since, as is more often the case than not with pork belly, it is too dry.
Still, there is not much even the best rider can do about a horse that is simply bad, which is more often the case than one might expect.
It is more often the case that a judge will seal some documents related to a criminal's plea agreement on the theory it could upend an investigation.
That should only happen when the joke is malicious or, as is more often the case, draws its "humor" from lazy stereotypes".
While the singularly gifted student may be able to navigate complex modeling software and complete architectural design studies concurrently, we observe that it is more often the case that modeling typically drives students toward two divergent outcomes.
The first room, though crowded with fine things, was small, and the tomb's orientation was odd — to the right of the stairs, not to the left, as was more often the case with pharaohs of that time.
