to be honest... lately I have done mostly event maps every day. And at some point I surpassed the 1 million gold mark.
And I just started playing near September...

Most of the event maps have good gold/stamina ratio, plus chance of life cristals and sometimes extra stages for the mayus.

Grinding events and life crystal farming I've rapidly gone upto near 3 million - only issue im having is having the stmina to run 12-2 I think or 12-3 farming for gardems to get mannys tto level

Current event maps are good for gold, plus Life Crystals are also a thing. Poking bosses and pulling equipment and basic girls gacha for vendor trash items is also a good infusion of rapid cash (a stack of 20 2* nets 5K gold, and you can burn 100K of seeds on the Gacha to get them without even noticing), items are also a good way to burn, or earn cash. Especially that burning part heh, but you can also sell them decently enough.
Best idea is to keep running event maps, and whenver you hit a critical mass of seeds, do the gacha and seel the gains.
This and - good gold use planning - If you buy all stuff for the garden, or keep upgrading your maxed out 6* with ampys each day, your cash reserves will diminish quickly (my case)

I've been leveling and evolving girls quite a bit the past week, not to mention upgrading some equipment, so I got pretty strapped for gold.
Luckily, I was about to level today, and my stamina was nearly maxed, so I grabbed a coin boost and did 8 Coin Rush runs for ~30k at 80 stamina each, so I'll at least have enough to evolve 1-2 more girls should the need arise.

TL;DR: Event maps are great! Also spend your money efficiently. I'm not exactly strapped for cash, but since I tend to level all 4 squads at the same rate they're all gonna hit max level around the same time. Critical mass evolution is probably gonna destroy my bank (assuming I get the bloom dragons).

Thanks for the advice, everyone!

Originally Posted by AcedPhoenix

TL;DR: Event maps are great! Also spend your money efficiently. I'm not exactly strapped for cash, but since I tend to level all 4 squads at the same rate they're all gonna hit max level around the same time. Critical mass evolution is probably gonna destroy my bank (assuming I get the bloom dragons).

Thanks for the advice, everyone!

This is only for your first month or two. Once you hit a certain level, where you stop having to "whack a mole" with leveling/evolving, you're going to be mostly twiddling your thumbs waiting for event girls or once-in-a-blue-moon (unless your name is Moarsi) 6★ girl, or the rare moments when you pull a 5★ that is marginally more useful than your current fleet of 5★ girls. Then cash, seeds, etc., will pile up to the point where you're spending flowers on expanding storage. Unless you have shitty luck and the only 5★ girls in your roster ARE event girls.

Originally Posted by Discoceris

This is only for your first month or two. Once you hit a certain level, where you stop having to "whack a mole" with leveling/evolving, you're going to be mostly twiddling your thumbs waiting for event girls or once-in-a-blue-moon (unless your name is Moarsi) 6★ girl, or the rare moments when you pull a 5★ that is marginally more useful than your current fleet of 5★ girls. Then cash, seeds, etc., will pile up to the point where you're spending flowers on expanding storage. Unless you have shitty luck and the only 5★ girls in your roster ARE event girls.

This is where I was at for a while... had nothing to spend my gold on. Then came the IWZ 2x 5* tickets and the 6* girl for 1k gold and a decent roll on a couple of 10+1 gatcha's. After that I ended up with 2 event 5*s 1 6* and 5 other 5*s to level and evolve... suffice to say my gold went down awful quick.