Need gearing (crafting) help to progress my ssf gladiator bow character

I'm pretty new to the game still... and I was wondering if I could get some help with improving my gear. I've been using a unique amulet for the mana regen - I'm scared to take it off - but I know I could use something a lot better.

I am sort of stuck using the bow and armor I have because they have 6 sockets. One is corrupted - I found it in a vaal area; the other is not. That 6-link bow actually dropped in a item level 73 area. I am curious which improvements/replacements I should go after.

Keep in mind, I am SSF, so advice should reflect that. I want to minimize the amount of time/currency where I can.

The character in question is "KatieGladiatorBow". Thank you!

https://www.pathofexile.com/account/view-profile/egervari/characters