Usually I only farm event missions for event curency, gold, life crystals and extra ampies. I'm doing daily manyu if I really need them or if I'm sure I can clear the event even if I skip some days. Same for dragons. I do them only when I need them or when I know I will need them sooner or later for a precise girl.
I'm also doing dragons and manyu if I had a lot of stamina when I'm close to level up.

But now for this event, since I already cleared it, I'm doing manyus and reissue or nation battle for the FG.

For gold, I'm just swiming in it. So, it's not a problem until I continue to farm event maps. I keep a large amount of gold for leveling girl with lvl5 manyu or for hard equipment leveling.

About Gacha Seeds... I don't use them. Just sometime I burn them in the gacha for extra gold and salt when I'm going to do a 50FG roll. Like a way of trying my luck and burn it in one lucky 4* or ampy roll.

Equipment seeds... I have so much of that thing. I only use them to get material for event equipment leveling.

Manyu: Actually I have no more interesting girls to level up. So, I only spend manyu and money on some event girls left on the bench forever and my gift box is full of all thoses lvl5 manyu. I need to get new girls from the gacha but... meh. Only useless gurls or dupe.

Dragons: don't really need them too. No girls, no dragons. I still have some lvl100 dragons from the previous event. I keep them for future girls but since my girl inventory is also almost full... I can't stack too much.

Ampies: I give all of them to my 6*. HP and DEF to Kerria, ATK for Christmas Rose cause Kerria is alreay max ATK.

Gifts: I only use 4 small gifts per days to clear the daily quest. I don't give more unless I need a girl done quickly.

Gold / Coin - I'm not actual farming for it.
It come by itself when I run 80 stamina main-event map and reissued-event map.
Normally I will run those two 80 stamina map for event currency.

Gacha Seed - I just burn it for extra money or summoning luck befor do single FGs roll.

Equip Seed - I random roll it from time to time to do some enhance for event equipment.
Most of my main girl have only 1 or 2 equip slot so I just let it be for now.

Manyu - I always run manyu map for fun since I still have many girl for leveling.
I may use 1 or 2 FGs to do extra run if I feel carried away.
I may stock up some Lv100 manyu for leveling my new girl that I like from time to time.

Dragon - I never stock any dragon except left over Lv100 one.
If I want it I just run for it right away on event day.
If I really need it BADLY I will spend 2-3 FGs to do extra run.