Why, hire an intern, of course!
Allow me to present a few temporary solutions to your problem to help you farm for the next few weeks until the Coli Gods figure out what kind of minmaxed stats are going to work well in the mire post-update!
UPDATE (2021-10-24 05:02:19):
With the VIT nerf of the armadillos, 120 STR is now enough to rally + elim every enemy.
I recommend @Yuubi's Mire Fisher 120STR build !
Intern option one: The Soft and Squishy
So, you have a tincture on hand and you just want your old rhythm back. You're not trying to level past five or six and keeping your flyer alive isn't the priority- you just need to level, and FAST!
Well never fear. Every enemy in the mire (yes, even those scary lil fungus armadillos) will be downed with a single rallied elim so long as your squishy flyer has 123 STR. I personally recommend refreshing on three-physical starting packs, and for this build it would be recommended to use Arcane, Lightning, or Earth as your dragon is already going to be quite a bit squishier than usual, seeing as adding four strength has dragged down both the QCK and VIT of your flyer down quite a bit.
PROS: No playstyle changes! Keep rollin' as per usual with your Mire Flyer!
CONS: You're going to have a lot more restarts and deaths if you aren't careful. I would really not recommend trying to level above LVL5, or maaaaybe LVL6 with this build.
Intern option two: The Sodden Raiders
Okay, so, you're tired of refreshing, you don't want to buy tinctures, and ideally, you'd like to not have to re-tincture your coli dergs in two weeks once someone figures out the real optimized build for the new Mire. Not to mention, you don't even have a coli dragon that's arcane/lightning.... those cute slime puppies are going to drive you insane.
Well here's an option that is friendly to any element, won't require a tincture change in a few weeks, AND can be used in one of the other best venues for fodder grinding- that's right, it's a Ghostlight Ruins team, here to save the day!
By using Chrisondra's amazing GLR single-fodder team in the new updated Mire, you not only prevent yourself from needing to retincture dragons later, but also give yourself a speedy option that can be used in either the Ghostlight Ruins OR in the Mire!
Another bonus: this build does NOT require the use of rally, which has a lengthy animation (yes, even with reduced animations turned on) and is typically a pricey stone.
Even better: if you have two pre-stoned 119 mire flyers laying around, you can use the two of them the same way that you would use Chrisondra's 122/118 team. They'll be slightly squishier, but they'll work just as well! Just scratch-elim every enemy in your path, and feel the power of zooming dragons up to level 5, 6, 7, and onwards with ease!
And in a few weeks, when we're all back to listening to Maki and Sylv's sage coli advice, you can just throw your team in the GLR and they'll be happy as pie!
PROS: Buff, tuff, and don't require a lot of new stuff! Reduce, reuse, recycle.
CONS: This is a single-fodder, two-trainer team setup. So, in theory, 1/2 the speed. In practice it's actually still incredibly fast: there's almost no refreshing needed, and your team can go MUCH further with two trainers than with one.
Intern option three: Just Keeping Hitting
Things might seem scary right now, change always is. But your 119 Mire Flyer still works, you just need to.... keep hitting. For the Furry Fiddle, Muckbottom Catfish, Fungal Garden, and Armored Colony, you just need to hit them with a scratch before hitting them with an elim. Yes, it messes up the rhythm and you're really going to want to refresh if you get them in a 3-pack to start, but otherwise.... it'll be okay! Soon this uncertain time will fade, like a bad dream....
Edit: Another thing to note is that the build I have for my Mire Flyer here is NOT the only option that works! @BlueLatios noted that a 119STR/64QCK/30VIT works well and is significantly tankier against all those physical attackers!
@Delotha and @Archaeoraptor also noted that using Haste can assist with the lowered QCK in both 119/64/30 builds as well as in the squishy 123 builds! I look forward to seeing if haste becomes standard in single-trainer teams.