Maybe better wings? If you don't have the first tier tracers or whatever they are yet, anyway. Think they're somewhere around the moon lord phase, and easily one of the best mobility accessories around (they're basically wings + mod upgrade spectre boots), which can help with not getting pigged on.
Taking down the moon lord'll help to no small extent too, most likely... some really nice stuff you can get with just the stellar junk and luminite (and yes, I'm going to mention the white dwarf set again 'cause that shit be broken*), even beyond the normal vanilla junk.
Minor incidental, actually, since you're coming up on it. It can be worth noting there's some odd interaction with the actually throwing dagger shadow weapon and the beacon of the assassin. For whatever reason, the thing causes the dagger to spit out the occasional extra projectile, kinda' like a normal ranged weapon, it's just a single shot of the dagger's alt fire and can stick on things and everything. Lil' neat, heh. Bit of extra damage and I think at least the extra shot still does the beacon's debuff thing, which is a nice bonus.
*Not actually broken, mind (mostly; I'm pretty sure either the books or the white dwarf proc were what was causing crashes with the storm weaver, so if you're using either when you fight it, keep an eye out), and it does take at least one accessory (and preferably a few more; for whatever reason you can stack up at least one extra throwing book if you wear them in the right order, and the effects stack up just fine) and the armor set, but a fast enough/multi-hitting enough throwing weapon plus that set and the throwing book(s) is just disgusting. You'll understand if you try it, methinks :3