I would suggest that learning SQL (the syntax) isn't the crux--it's just syntax you learn over time based off need, just like learning python--what you need is motivation. I'd suggest watching this video to get a flavor of how much leverage using the database can give you: https://www.youtube.com/watch?v=wTPGW1PNy_Y If the database can make you more productive and more efficient and make your life easier, you now have incentive to use it more.

Another thing that took my use of databases to the next level, was using PostGraphile (https://www.graphile.org/postgraphile/). It takes a PostgreSQL database and provides a GraphQL endpoint for it. Use that as your only backend. You can use PostgreSQL row-level security to do access control (who can see or modify what). You can use PL/pgSQL to write business logic for higher level calculations. You can use constraints and triggers to do data validation. Each of these areas has an initially steep learning curve, and wonky syntax, but once you get over them you can implement many backends extremely quickly with them. And using PostGraphile where you only have SQL available (well, you can also add javascript extensions, but try to limit those) will be a great forcing function that will require you to scour stackoverflow and the excellent PostgreSQL docs to learn many of the useful corners of SQL you'd never learn otherwise.