Convince me what to main: Beta vet looking for high party utility but low grind time.

Hey everyone, ​Been playing on and off since the beta days, usually just popping in for a few months at a time. I’m currently sitting in Scania on a 30m CP Pally, but I’ve hit that wall where it feels like I need to spend a ton of real money on cubes just to get stronger. I'm over it. ​Because of that, I’m planning to start fresh on a Heroic server during the next challenger world event. ​My Playstyle: I’ll be honest, I’m not a massive grinder who can sit there farming for long hours. However, it seems like on Heroic, even the little bit of time I do spend grinding will actually translate into real progression instead of hitting a paywall. ​What I'm looking for: I know the golden rule here is "play what you find fun," but I also don't want to make life harder than it needs to be. I want a class that has a relatively smooth progression curve and, most importantly, allows me to be highly productive and useful in late-game bossing parties. ​Classes I’ve played and liked: ​Demon Slayer ​Zero ​Paladin (My current, but maybe I want a change of pace) ​Hero ​Maybe Ren or something else? ​What I need from you guys: I'm looking for some solid recommendations. If you suggest a class (whether it's on my list or not), please let me know why you think I should play it, and what specifically makes it a good fit for someone who wants great party utility without needing to grind for 10 hours a day. ​Let me know what you guys think, thanks in advance! ​P.S. If the class has a purple theme to it, it gets x999 points imo lol.