As a minor, your best bet is to avoid big, bold claims
before you become a major.
And if you intend to remain a minor, maintaining that smaller scale for your group, it's probably better to maintain a narrative/status that suits being a minor.
For example, could you make a Republic on Coruscant? Sure. But it would (likely) be a grassroots movement that's probably a few dozen or few hundred in number, with very little in the way of influence when it comes to the major that controls the planet. And if you started throwing your (minor) weight around, demanding the major recognize you and respect your (minor) faction's demands to reform or bow before you, then... chances are you'll be ignored, or outright overpowered by the major's infinitely superior and readily available resources.
My best advice would be to follow these steps:
1. Make your minor with growth (major) potential, but avoid claiming that status without the IC development (of becoming a major)
2. If you seek to oppose a major, reach out and discuss with that major, and see if there can't be some interesting plot to be had (which could support step 1 for your minor)
3. Remember your minor is a minor; you will be inferior in every way to any major you're up against, so don't shy away from that and consider embracing it (a Republic might start as a Rebellion, for example!)
4. When in doubt, talk it out - approach those you want to engage/involve yourself with/under/around and just chat about options (if that major has any semblance of genuine community spirit, as those above claim, they'll respond and offer opportunities to work together if they see your effort as equally genuine and plot driven)
5. Don't assume everyone will just accept your minor as anything but a sizzle in the pan (this ties into 4), it's up to you to reach the level of grandeur you want the faction to claim, so get to it!
TD;DR: Start small, be open to evolve into a major, otherwise play nice in the sandbox with the bigger kids and build things together.
Also, when it comes to ignoring/recognizing events from the community, you will find a lot more respect and kudos given if you incorporate what has come before you; for example, if someone wanted to create a Chiss faction, having the destruction of Csilla included in that faction's existence would get them a lot more traction than a group who outright ignore it and just 'exist on (non-destroyed) Csilla'.
I pose to you this question: Why should anyone recognize
your plot developments, if you ignore
theirs?