If you do backend web development in 99% of software companies then being very good at whatever your RDBMS is is a superpower.

It's definitely worth learning SQL very well, but you also need to learn the data structures your RDBMS uses, how queries translate into operations on that data, and what those operations look like in a query plan.

You can go surprisingly far with just that knowledge.

A great resource is https://use-the-index-luke.com/