I'm a big fan of POE and have been playing it since the launch. And I think despite the big amount of bugs, Wolcen is in a good state and really promising.
You talk about deepness but also say your build is shit and you're stuck on a boss. There is a lot of builds in POE that would require you to dodge and/or play fast. Like in POE, if you don't want to do that, do another build. The good thing about Wolcen is that you can easily rebuild at anytime for almost no cost.
"there is no "deepness" in settings like in poe". There is less "deepness" in Wolcen, which is understable for a game that young. You can't add 150 spells at launch, it would be a mess. You make a good base, and expand from it.
Still, there is already some deepness to Wolcen. I did three mage build, with very different gameplays. But for that you need to take the time and try to understand the mechanics of the game. Unlike POE, Wolcen is new, so you can't just follow a guide on the internet and say "omg it's so deep look at my complex op build".
Willpower regen and transfer, ailments, crits, resistances. You need to understand them if you want to make a viable build. Like you would do in POE.
Note: i'm currently at parangon 140+