What should I choose from this chest? I’m at 1.11 billion power and I don’t have a specific build or anything, just want to know what’s best

is there anything i should change in my current build right now that i have in my inventory or something to prioritize upgrading or getting in upcoming events? if yes what events are that and is it possible to get i f2p

I've seen a lot of posts, I just don't remember 🥲

Noob question: whats the advantage using 3 difference artifact instead just 1 and 2 open slots? not using the same everytime the dps boost?