I'd say there's no hurry to get to Bravely 2, as it's not a very successful love letter in my opinion. Bravely 1 is definitely the better story. Octopath 2 on the other hand does the opposite, it takes all the stuff Octopath 1 did and improves on them.

Triangle Strategy is the wild card here. It's a good strategy RPG, but it's really directed towards the people who enjoy the long cutscenes and dialogues of Fire Emblem games. Most of your game time will not be spent playing a strategy game, it will be spent reading expositional dialogue about the political machinations of nations and so forth. If that's what you're hankering for, go for it. If not, then start with Octopath Traveller 2.

Have not played any Bravely Default game so can't comment there. Triangle Strategy and Octopath II are both very good in different ways. Triangle Strategy is the more "intense" experience with a very complicated story with a lot of talking that takes itself rather seriously and a very in-depth (fun!) combat system. Octopath II is also very talk-y but is slightly more light-hearted and relaxing and very grind-y in a traditional way. If you played Final Fantasy VI and Final Fantasy Tactics, and enjoyed the former more, go with Octopath II. If you enjoyed the latter more, go with Triangle Strategy.

I think these all have free demos available so you may want to check those out to see which one grabs you the most.