Some advice for gold saving:
Avoid fully raise 6* with ampies at your level. Wait for more and more gold.
Don't raise 2*, 3* and 4* level. Actually it's easy to deal with event stages just with a few event 5*, 5* and 6*, the 4 lvl 40 2* you got at the beginning and some 4* used as placeholder.
Use the highest manuy and always ten by ten to raise your girls.
Don't be afraid to use stamina potions on golds maps when there is gold bonus campaing.
Buy garden pots for your garden if you don't have them. Garden pots gives gold. Sometime a lot like 10000 gold.
You can turn your event currency leftovers into gold at the end of the event. If you don't have much to do, think about over farming event. Espacially when there is gold campaign once again.
I think building a solid gold stockpile should be the second main priority in the game, just after building a team able to do all event stages.