This is a solid answer, but I'd also add - there are very few general music buffs.
Maybe I'd count, with years in pro music performance, degree in Jazz and a lifetime of listing to and performing an insanely wide variety of genres... but not a buff for all styles.
Computer systems are actually not a bad analogy. How many people do you know that have an in-depth knowledge of Assembly in different systems (including the oldest ones), GPUs, ML, Python, JS, Haskell, C++, Rust, ALGOL, Compilers, Hardware development, etc. Then add into the mix having an in-depth knowledge of the creators of those things, what else they did, failures, influences, their mentors.
You always have the choice of breadth versus depth, within your time constraints. I think learning about a single artist or band, looking up the producer, label, members and following up on all those leads to see what else they have done - and see if you like it is a great beginning.
Some genres like jazz might seem difficult to get into, and that's fine. No need to delve in until you find a hook that peaks your interest. And then when you find out about a genre (and jazz is an excellent example) - you'll find sub-genres you like, and don't and maybe you are interested in the evolution - like many people love bebop, but don't listen to "dixieland jazz" or big band swing, or modern fusion.
You will never hear all the music. But depth (in my opinion) breads a lot more passion than breadth just for the sake of it. So rather than listening to all the top 40 singles of the last decades, you'd probably be better off listening to some whole albums, and exploring from there.
Spotify (and similar) make it very easy for breadth, and can help discover new music you like - but you'll need to put work into delving in deep yourself.
As you do have a passion for film I'd suggest this.
For interesting modern music Quentin Tarantino files always deliver.
Danny Elfman has some interesting stuff (like this Simpsons theme which is a great example of the Lydian mode...)
John Williams & Hans Zimmer have made loads of epic soundtracks, and if you like them - look up Holst, Tchaikovsky and Wagner
If you want a weirder launching off point, watch koyaanisqatsi and look up Philip Glass who made the soundtrack - that's an interesting avenue, albeit not very mainstream.
Another epic film score is 28 Days Later, John Murphey - parts of which have been used in loads of other huge features like Kick Ass...
You could also go a different route, and look up how the pre-classical Pachelbel's Canon contains the chord progression that is arguably the most popular of all time and watch this mash up of songs that use it (or the first part) https://www.youtube.com/watch?v=oOlDewpCfZQ
Hahahaha, I could go on forever! I hope you find something you love, and actually want to go deeper into.