So I Have A Lot Of Orbs

Use them when you need them. I’m in the same boat you. I got 850 orbs at the moment and I only pull for units I really want. I feel that I don’t need to pull on every banner.

Just keep saving them if you feel you don’t need to pull on any banner.

If you want to spend all of the at once then i'd recommend you to use them when you have someone you're interested in a legendary banner, do not absolutely use that many orbs on 4 man banners, the rates there are awfull, you have higher chance of pulling red pity breaker rather than the focus and you have the same rates with focus and non focus for blues.
I say this by experience, i saved up more than 1000+ orbs for CYL2, decided to aim for B!Hector and in all those orbs i only got 3 since i kept getting pity broken

That's good. Keep your orbs around. What you seem to lack is a solid objective, so let me give you the best forseeable way to use them (keep in mind that things might change with the upcoming of Book III).
• December Legendary banner for Fjorm (if you haven't got her +10 already) and L!Hector
• Otherwise, January Legendary banner for L!Tiki

People usually save up to either spend it all to +10 someone or to get a ton of different characters on a legendary banner.

Generally, it's hard to go wrong with waiting if in doubt. Very few offers are so good that they are a mistake to pass, and you'll probably feel instinctively when you see one.

I also recommend being a bit cautious until the next major update drops, whether it's 3.0 or 3.1 or 3.2 or 2.11 or whatever. A lot of people including myself are expecting some new features which will change the game significantly like weapon refines and adaptive damage on dragon breaths did about a year ago.

If you want more specific direction, we'll need to know your goals in the game and whether you feel like there are any underfilled roles in your barracks at the moment.

I recommend waiting until you have some goal in mind when deciding to pull whether it's for pure fodder or more merges. Legendary banners are the best bet in most cases because no off focus pity breaking along with the seasonal blessing from pulling any legendary unit. I was pleased to have pulled a few Hector's to save for DC fodder when I decided who I wanted it on.

Damn I don't even know how you guys have that amount of self control. It's hard for me to save orbs, I've got 70 right now and the most I've ever saved was 300. I always get tempted since there's always at least one character on a banner that I like.