Angelito

I'm Playing alone on the PvE server and now i've reached the maximum level. I wanted to have more points to learn new skills. And i do not understand. For a source od Youth, to live forever, if i can not keep on making progress? What is the Logic? I can no longer reset my attributes and the game says i should explore. But it does not resolve it seems that my EXP bar is bugged. I was very excited about the game, but now i've had a bump. why does not the game have a Single player mode?