Should I lower the world level?

Somehow I got the world level up to 5(I was speed running lore) and got my world level increased the thing is I am new to the game so my characters are downgraded and my artifacts are just some popular purple ones and I don't even know what to upgrade and in what way, world level 4 was challenging already So what characters should I build and what are some good beginner friendly parties that I could make out of this mess, I am f2p btw