Collecting knowledge of various technologies-of-the-now isn't really a point of pride in the field, unless you're aggressively doing résumé driven development, which is a short term win, long term lose strategy.
But yeah, I'm glad you've come to see that. And yes, just use Postgres. As I like to put it, unless you have a really good reason not to use an RDBMS, use an RDBMS. But we're living in an era where bootcamp grads come out knowing only JavaScript, and MongoDB lets you make queries that resemble JavaScript, so it becomes that thing of "real professionals choose technologies for which there is a large talent pool".
Being able to use kubernetes for infrastructure, grafana, prometheus, etc Elasticsearch for search, Mongodb as database, redis as caching layer.
Knowing all these tech and being able to say you know these very well used to massage my developer ego...
Now I am much more like: Use one system to best of it's capability. Use Postgres. Mostly you won't need anything else.
I never resisted to urge to try out something new and shiny in production in earlier days.
Now I mostly use boring technologies and things I am comfortable with running in production.