If you're focusing on PK% instead of total PKs, then one way to get to 35% would be to just die less often. So that's an option.

Otherwise it's some combination of skill percentages, gear, preps, picking on people you match up well against, then doing the right stuff in the fight.

That last one is greatly aided by having a set of aliases that allow you to actually input the commands you want to input in the heat of the moment.

Another idea: log everything and, when your character is gone, post logs of fights ask for feedback on what you could have done differently.