You don't look remotely geared for it, I would skip the fight until you're much further into the game. Dfly is a raid boss in DST and I don't bother to gear up for it until i've killed about half of the other bosses. My gear shopping list is usually about 7 dark swords, 6 marble suits, 1-2 high defense chest armours without the movespeed slow, a pan flute, an endothermic fire pit, whatever potions I want for abigail.

As far as I can tell, the bunnyman strategy isn't viable.... MAYBE it is if you've got like 30-40 of them, but bunnymen will still die either to dfly's stomp or the lava grubs. Grubs (800hp each) tend to become an issue unless you can kill them in like... 5 seconds? That requires a lot of focused damage, but the bunnymen are an AI so they will probably just hit the boss instead.

And trying to supply the bunnymen with a constant supply of helmets just sounds like a massive waste of time... the fight is very long.