Hey
@Awnry Abe. Welcome to the forum and the hobby! With 42 batches under your belt, you're likely past the novice stage, but the leap to expert can take a lot longer. I have over 200 batches and 15+ years and still consider myself an intermediate brewer. You'll run into many true experts in this forum that are willing to share their experiences, but I encourage you to stay curious and continue your own experiments. Many great ideas came from novice and intermediate brewers like yourself, so share your processes and successes as well as your failures. We are a continuous learning community.
In my opinion the biggest leap for me was switching from extract kits to all grain. The kits all had the same underlying taste profile to me. They were drinkable for sure, but moving to all grain really allowed much greater profiling of beers I enjoyed. Secondly is moving to kegging. Some may disagree, but the additional sugar you add to prime bottles also changed the taste. To test that, simply prime some bottles with corn sugar, prime others with table sugar, and others with honey or sugar in the raw. End result will likely taste different. Kegging eliminated one less variable. I still bottle a few for family and friends if there is beer in the fermenter after the keg is filled, but I enjoy opening a tap instead of a cap. I would also strongly suggest keeping good notes of your brew day and beyond.
@IslandLizard provided a great list to start with. Everything from recipe, to process, to conditions, to events leading to cracking open a bottle or flowing a tap. While there is still a lot of dogma out there, you will often find little things can make a big difference in the final product. Good notes will help in your quest for the perfect beer. Lastly, don't be afraid to dump (or repurpose) if what's in the bottle or keg is not enjoyable to you or others. If you don't dump, you'll wind up with way too many bottles or way too many kegs. Ask me how I know. Life is too short to drink crappy beer.
I leave you with a fitting homebrewers quote, "Give a man a beer and he'll waste an afternoon. Teach a man how to brew and he'll waste a lifetime.". Of course the same is true for women brewers too but I did not want to mess up the quote.
~HopSing.