Let Stories Incubate
Yes, I know. Murder, corruption, betrayal - I know. I would point out murder is only ONE THIRD of those options. Stories must be allowed to incubate and wind their fibers longer and around one another to begin to form a tapestry that can support an in depth plot. PK often times cuts those threads before stories can form. It ends up creating stagnation and causing the plot to flatten. It can also result in good RPers stepping back from the game temporarily or long-term. This has the potential to shrink the game or at the very least shrink the area you are playing in as players flee to other areas they have less potential get PK'd frivolously. To me, I see the sandbox shrinking. Logging on on a Friday at what should be peak hours to see 13 players? Not good. I'm not saying don't PK if you feel you absolutely must. But there are other ways to sabotage and niggle your enemies and that is part of the fun - observing those long term rivalries. I would strongly advise to keep things interesting a good hard look be taken at PK, a thread of it's own I plan on starting soon.
Find Reasons to Interact With People
Find reasons to interact with people. Just do it. Ew, a magicker. My character would never interact with them. Then just wrinkle your nose at them. Call them a witch. See a half-giant? Try to get one over on them. Walking down the street and see someone, find a reason to ask them what's up. See someone in a bar just tavern sitting? Find a reason to engage them. What do they do? Can you trade with them? What are they all about. And if you can't be their friend how can you be their rival? Not all interaction has to be a positive, happy go-lucky interaction. Just interaction. Start stories, connections and plots. Ask people what they do. Ask personal questions.
Don't be Afraid to Show Emotion - Don't be Afraid to go There
Is your character having a mental break down? Show it, or hint at it. Wounded? Roleplay the shit out of it and then role play your injuries. Develop your characters weaknesses, nuances. Consider writing a short story about them. Add it to your bio. Know when something would trigger them a little or a lot and then role play it out subtly or not so subtly.
Take Risks
This isn't Instagram where it's about living the perfect life. This is a harsh desert world where everyone is scraping for power, coin, prestige and maybe a few precious people they can trust. Take a risk on that newb. Let someone live. Stalk, steal. Say something blunt. Don't constantly resort to PK but don't always worry about hurting someones feelings. Make fun of them for being a breed, magicker, mutant, elf. Have bias. Start a company. Go on crazy adventures. Get people in on wild plots. The game stagnates when PCs treat everyone like they're equals and it's time to network IRL.
Keep the Lore and Society in Mind
This game has been running for a long time. There is a wealth of lore and while it's fun to play little exceptions here and there the game, in my opinion, really comes alive and starts chugging along when people embrace that lore. Half-elf or rinther? There's gotta be a way to sling a micro-aggression or be passive aggressive. Maybe to your dying shame you're attracted to half-elves, but publicly? Ew. See a noble or Templar, grovel and throw coins at them. Help them get plots started in their roles. Learn about the Elements, superstitions, diseases - find a nuance of the lore and run with it. Make it come alive. Play up tropes in the game when you can. Think less about how long a PC has been alive and where their place would be in society.
Avoid Exposition
One of the first rules of creative writing is show don't tell. Write yourself a background, figure out who your character is and the filter that out through interactions. IRL you don't walk into a bar and drop your life story. Take it slow. Hold those biases, return to those fictional traumas you've made for your character and let them seep into everything you do. Make people curious about why you're acting the way you are. Let the storyline unfurl and then let RL events shape you. Combine this with only PKing when necessary this gives time for stories to truly develop which will increase interesting interactions.