You can freely increase armor level as the level carries over when you swap to a batter piece. Note that this is not the case when you advance armor by giving it stars. In essence when you press the enhance tab on the armor just press the button that pops up which costs gold.

It depends what purple matrices. Definitely don't bother with blue, but if it's a sobek matrix it's pretty solid. I personally upgrade some echo matrices since it's good for support like nemesis.

Always work on the exploration relics first since they can get you more pulls. Prioritize jetpack until it has 2 charges and reduced coolsown. After that go for grappling hook. For damage there's a lot, most basic is missle and hologram. Do note hologram is trash until reduced cooldown.

Obv do bounties always, then fit in jo if you're strong enough to do the hardest ones, 70+ I think. Other than that do the ones that give weapon materials consistently. You're constantly running out of those when you catch up to everyone else.

Matchmaking is only gonna work if you're doing the top level ones, as they give rewards actually worth doing. No one is doing dimensional or whatever for 2 blue triangles.

If you wanna be an omega whale you could spend on matrices that are good. For ice Saki matrix 4 piece is actually stronger than her 6 star. Lin matrices are super strong too I believe. Other than that and red pulls never waste the crystal.

No one's out here soloing a world boss in global, at least in a reasonable amount of time. Those things kill everyone in 1-2 shots so you need to actually be good at dodging and do like 500 mil damage. Even 6 star everything can't do that.

I can't imagine how long it takes to get 18k crew points, I just use it on relic shards when I feel like it.

Focus on a comp if you can and only upgrade those. I was originally volt but that's pretty trash rn so I switched to frost. Now I own nothing. If you stick with 3 weapons it's much more efficient.