I think it's normal for authors to re-use plot devices, character archetypes, or narrative structure for a variety of reasons. Off the top of my head, I re-use:
-Younger generation fixing a "mistake" caused by the older generation (typically a parent or grandparent)
-The father of the MC is either missing, dead, or they have a strained relationship. In one WiP, the mother is also dead; in the other two the MC has a strained relationship with their mother
-Historical settings; usually between the Victorian Era and pre-WWII
-MC learning that the world they believed they knew isn't what it appears to be
-Male/Female relationships that aren't romantic (romance is pretty much background noise in my WiPs to begin with)
-A murder (or murders) instigates the initial plot
-In two of my books, the chemist of the group is a female
Some of this stuff comes from my interests (familial ties; solving puzzles/mysteries). Some of this stuff is wish fulfillment (females finding achievement in typically male-dominated fields). Some of this stuff is things I want to see more of in the media (female and male non-romantic relationships; a female MC who isn't defined by a LI). All of these things ensure that I want to write these stories.
On paper, it looks like I'm writing the same novel. But of my 3 "main" WiP, one is a Sherlockian mystery, one is a time-travel/Speculative Fiction, and the other is horror. Two exist in alternate timelines and one is more grounded in actual events. The motives behind the murders that occur in all three WiPs are different: one is for revenge, one is the villain eliminating threats to his master plan, and the last is for survival (monsters have to eat).
If there is a theme or character type that you happen to like, the trick is using it as a base and then molding it to fit your characters, tone, and plot, all of which should be different depending on the story you're telling.