well that's fine, however you want to play is okay, since its a game and you should be playing for fun. If you want to be tough and strong and beat everyone else though, or save up for good things, then you need to actually build a class up all the way.
Kaho is an item, costs 100$ to donate, about 80mil to buy in game (price is always changing because of ad credits though) - anyways, it gives really good stats, which is +20 to dex int and str - and some defense too I think.
I would suggest joining a guild, that would keep your interest in your class longer since you lvl up with parties. Dont join a WOE guild though, since they'll expect you to attend woe and be contributing a lot, and then it just sucks.