You could align with one of the associations or third parties working to change things, and hope to be able to play some role in making the situation at least a little better. Support from the general public for some kind of third party is at an all-time high, so that might be taken as a sign that all is not lost.
As for which one of the third parties, that would be something to decide in accordance with your own values and views, but most of those that get mentioned around here are so weak and face such uphill battles simply to exist, that you probably should think twice before joining any of them.
Of the existing third parties, the Libertarian Party is definitely the strongest in every respect, has been on every state ballot for the past two presidential elections, has good name recognition, and so on. There is also the Green Party, but its fortunes fell in the November 2020 election because this very progressive party has been undercut by the emergence of the Progressive/Socialist wing of the Democratic Party.
And because you identify as a Republican at present, I doubt that the Greens would appeal to you anyway. That brings us to the GOP itself. The party is unofficially split at the present and you might want to consider throwing your efforts behind the faction that is fed up with business as usual and with supporting those "Go along to get along" Republicans who are in elective office at present.