Move fast
play efficiently
sell regularly
play to your strengths and preferences and try to make yourself well rounded by improving weaknesses
Ultimately that's all it comes down to
Take out every skelly ship and meg you can
great loot, great for emissary rep, easy to do with no time for people to tuck or sneak up on you
Island captains
lots of them, an easy villainous skull, get fast at the riddles and it's easy loot
Waste no time running or hiding either fight or leave those that attack you and start a new server asap. It's easy to get more loot and another flag don't waste your time.
Don't stay in one place long
Don't worry about an emissary being a target. Killers kill it's what they do no matter what you're doing. Focus more on how much it benefits you rather than worrying about what might happen.
Emissaries are ALWAYS worth having on. No reason to ever stress about them.
Take the losses with the wins. We all sink no matter how good we get just focus on overall putting in the time and effort and efficiency to where it doesn't matter. You'll bring in more than you lose. Good luck happens just as much as bad out there stay positive