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DINODOGGED
The bad news is there's more grinding to do. The good news is that you have more options, and this time, the grind should be much faster and less painful!
Peeking at the dragons on your Coliseum team, you might want to start a new team of 3, this time following
EeveeDream's Leveling Guide. Scroll down to "ASSIGNING STATS: SHORT VERSION" in the first post and follow the recommended stats & stones per level; the rest of the guide explains the hows and whys of each stone and increase, but the chart is there for reference.
The Coliseum is balanced for dragons prioritizing STR, QCK, and VIT in that order, and as you've likely noticed, even a few stats out of place can slow things down significantly. AGI straight-up doesn't function correctly, but even if it did, speed & survivability are still a bigger priority in order to end battles before taking too much damage. EeveeDream's guide is our most up-to-date reference on how to balance a training team accordingly.
If you want to stick with the current team, you
can reset a dragon's stats using the
Tincture of Dissolution in order to re-assign the points, but at 30,000 Treasure each for 1-use items, 90kt is a bit pricey when you have other dragons available for free - and if you can still afford that, you're almost halfway to affording a L25 with Eliminate anyways.
If that's the case, you can search for
Level 25 dragons on the AH and check their Battle Stats to see if they have the coveted
Eliminate stone before buying - which you're going to need for future Coliseum battles.
Either way, you'll want to take a peek at the
Coli Builds List and consider planning ahead. Ideally, you'll be able to pick at least 1 dragon with a strong element against a L20+ venue of your choice in order to train future dragons. That way, you don't have to go through this teambuilding process again.
Since the Mire is the fastest training venue, it's recommended to bring an
Arcane or Lightning dragon and give them a
"2-fodder" training build once they're done. Maki's
Battle Stones Guide should also be helpful for general questions about battle stones and the Coliseum.
If you have further questions, you're in the perfect place to ask!