There are so many sectors when it comes to blockchain it's somewhat hard to choose where you want to start. I like to think of it as an MMO, where there are different 'classes' or 'roles' that dictate how you play the game, to some degree. However, if you're like me you create multiple characters with different roles because you like to switch things up. You can apply the same concept to web3. Nonetheless, everything interconnects despite specialising in the different fields.
So, you've been doing too much PvE and want to get into the on-chain PvP scene. Be wary traveler, this is a lonely environment to be in if you're playing solo. You will spend months building to upkeep your infrastructure to stay competitive in the MEV world on Ethereum, unless you find a very niche strategy. However, the booty is high and mighty if you manage to pull it off! If that sounds like something you want to do, continue on.