(1) Don't spend flower gems on summons unless a special event is happening (When I first started my JP account, they had reduced price draws, and I had to take advantage of them) ... save them up for slot expansion, and other things.

(2) Use Manyu for leveling. Don't worry about expanding number of teams early on. I highly recommend that you grind out old maps to get 3 flower ratings on each of them for bonus rewards. At these levels, it's easy to rank up. Sell off any unneeded low cards (unless you're going for skill-ups to unlock equipment slots)

(3) Always hit the Gather and burn all 3 of your seeds. Do this every rank up (timer resets and you get 3 seeds every time you rank up) You get coins, gifts (to give your girls), Gacha seeds, etc. VERY IMPORTANT

(4) Try to participate in as many raids as you can. This might be difficult in your time zone if not enough people are playing.

(5) Farm/gather gifts as much as possible. As your girls relationship levels increase, so does their stats. This is the only direct method of stat improvement other than leveling (and once you've capped, it really is the only improvement you can provide those girls unless you evolve them)