Lv45/chest50 original AF1 (iLv50/chest55) gear is armoirable. You could also toss them if you want, as they're available from a Calamity Salvager.
Lv50 AF1+ (iLv90) gear is exchangeable for Antique tokens from Snowcloak, Qarn HM, and Sastasha HM, which is easy enough to get--after a few unsyncked runs you can have the whole set in a matter of minutes. Just toss what you're not using.
Also, AF1 has a dyable version, so AF1+ is unnecessary unless you super want the exact color scheme of the AF1+.
Lv80 AF4 from not-Gerolt can be repurchased from not-Gerolt for free. Toss.
Relic Weapons that you have completed have Replica versions that can be purchased for pennies, so just toss any relics that you aren't specifically keeping to use for Ultimates that cap at that relic's level.