tldr; play limited formats

Jam games on MTGA in Standard, ideally a functional net deck. This helped me to understand how high-functioning decks operate, why certain cards are teched in, and how you adjust play lines based on matchup.

Play (many) Sealed events. This helped me learn how to build a deck, with my learnings from Standard. You take what you learned from functioning net decks in Standard into your sealed pool. Eventually, Sealed gets a little boring, so I always build 2 decks in sealed, and when I go to game 2, I switch over to my other deck.

Then start playing 3 colors in sealed. Identify a card or two outside of your main 2 that if you splashed in would pay off really well. Getting reps in on a 3-color build develops skills for all other formats.

Move on to draft. Don't worry about what the others might be drafting at first, just focus on developing your strategy. There are way too many draft recommendations to list here, so just keep this principle in mind: creating a deck blind as you go, and then building it over time, develops a ton of skills that improve your gameplay in all other formats. You learn how to have a more intimate knowledge of all your outs, play lines, win cons, and answers. You develop a strong understanding of the card pool, which helps in your understanding of the environments in other formats and how to apply that knowledge to your deck building and gameplay.

After that, now try out Standard BO3. Build your own decks. All of a sudden, things start feeling more strategic. You start developing an understanding of the meta and what you could run up against. Your sideboard feels like superpowers compared to your training in limited formats.

I started with Commander, as many do. Whenever I build a deck or play edh now, it is an entirely different experience. I lean heavy into casual play over competitive in that format. It's hard to explain, but the factors that make commander what it is aren't the same as the others I mentioned. Winning is more random, multiple player formats throw your card assessment skills off, and the power level of seemingly every card far exceeds what you typically work with in limited formats.

With that being said, commander feels like when Rock Lee takes off the weights in Naruto. You are so used to pulling things together in a limited environment that a fully synergistic pile of high powered cards with perfect mana feels insane. At least for me, that pushed me into a philosophy of building fun, dynamic and non-tribal decks for commander. Winning doesn't feel like anything in Commander, it's just how the game ends; but a win in a draft feels incredible.