Orb ration strategy

Hey, I almost have the same amount of orbs as you do (84 on my end). When it comes to a banner on which I am 100% sure I want the units, I'll roll at the very start of the banner because that gives me bonus units for arena and Tempest Trials. If I don't pull someone in my first round, I'll scrape together orbs throughout the month and roll whenever I feel confident.
If it's a banner I'm kind of meh about, I wait until the end, see how many orbs I have (usually around 100+ is the benchmark for me), and then summon if there are no other banners, current or upcoming, that I'm interested in.

Spend on the Bunny banner if you really want bunnies

or if you don't care that much for them then either wait for the thracia or legendary heroes banner.

But take note bunnies are cute.

Personally, I am going to try for a single Kagero and a Chill Res for Reinhardt. I am waiting until I learn what is on the Legendary banner before I start summoning, though. Though highly unlikely, if there's a Chrom, Frederick, or Hector I will forget all about the Spring Banner.

I have saved around 200+ f2p orbs and I will be going for catria only.I wouldn’t mind a kagero but I really want catria, I also am saving heavily for the legendary banner so I plan to spend anywhere from 50-80 orbs on the spring banner and 120-140 on the legendary hero banner.

Do what I’m doing. Get the free summon and use the 15 orbs for the rest of it, then save for legendary banner. :)

Just Wait.

I’m going to spend enough to finish the first circle, then hold off until after the Legends Banner, as I want a better IV Shigure, a Micaiah (she might appear there), and there may be a Colorless Dragon coming.