Try building your weapon pool. Focus on the element that you're strongest at. If you're level 30 and above just leech from those "Omega" raids and hope to get stronger weapons from there.
._. i done that w/ story char and Rare char and mine only lv 30 all try to limit break it and find another good weapon from magna and raid ofc only can be leacher TvT i only use rare weapon and 1Sr weapon from quest ._.
Have you limit broken your characters/ done their fate episodes to get their extra abilities? Also choose your allies to give a dmg boost (E.g. go all 1 element if you can). Have you tried changing/upgrading your job class
Not sure if any of the mods still support this community, but they should be aware that the forums are infested with bots and that their forum needs to be upgraded.