If we ever hope to change things, there seems to be a few pre-requisites in my mind.
1. End the current plague of career politicians! Term limits are an absolute must.
2. We need to seek out and elect different people to send to Washington DC. The current make up of Congress is little more than a rogues gallery of crooks and grifters.
3. Demand that congress pass a balanced budget requirement.
As Thomas Jefferson said so long ago, The enemies of the people are organized crime and government. Let us chain the government firmly with the constraints of the Constitution so that the government does not become a legalized version of organized crime. Not intended to be a quote but the message of Jefferson is clearly communicated here.

I was a Republican for years and served on the city committee, delegate to state conventions, etc. I am now registered as unaffiliated. Here are some of the reasons.

1. Everytime there was a conflict with Democrats it is the GOP that caves and compromises.
2. They run pathetic, wimpy campaigns. McCain and Romney ran two of the worse Presidential campaigns ever. The recent governor's race in NC should have been an easy win, but the campaign was a disaster.The 2020 Congressional campaigns gave nothing for which the people to vote.
3. The GOP suffers from extreme poor leadership. It is beyond me how the current GOP chair has kept her job and McConnell should have been gone years ago.
4. There is no unity in the GOP because it tolerates too many RINOS.Give it to Democrats to always be unified.
5. The GOP is intimidated by the MSM and never realizes that it is never going to give them good publicity so they need to do what is right.
6. The GOP does not define the uncompromising principles on which it stands.
7. Just electing someone who calls themselves a Republican is not enough, if you cannot depend upon them when things get tight.
8. The lesser of two evils is still evil.
I could probably add more, but this gives an idea of why I am no longer a Republican