This game is not a regular RPG, pve stuff helps with pvp more than in other games. In other games you have to do PvP in order to get better items/buffs for PvP, but here is different. You have to farm products, spend time to do 15 sec jobs for money in order to get PvP items. You have to participate in events, usually with PvE stuff (mostly 10 minutes or 1 hour jobs, quests etc.) to get items, including PvP Items.
Of course, not all classes should have the same bonus, but that doesn't mean that only one or two classes should have advantages in PvP and the others not, especially when the game has changed a lot in recent years, the adventurer was good before , now it's not. Do you understand? This is not players' fault, and changing the class is not possible. I haven't seen anyone say that the adventurer should have advantages in adventures, as is normal, in fact, that's why he's an adventurer, right? You come and explain that the soldier must have advantages in duel, and the duelist in the forts, that's the logic you understand, a logic that makes no sense. If it was as you say, only the soldier had a fort bonus and 0 duel bonuses, only the duelist would have had duel bonuses, only the adventurer had bonuses in adventures (but he doesn't have any), etc.
There is no point in starting again on a new world, because all the new worlds die within 1 year and you would gave up everything you worked for in the last many years on your main.