Here's a brief outline of the Problem.
Be sure to keep reading, to reach the Solution.

To understand the Strategy for reform, you must first see how the current system operates.

Public approval of Congress has been low for years, with complaints about big money, gerrymandering, and the gridlock of extreme partisanship. Despite this, incumbents are almost always re-elected. Why ?

Imagine yourself as a typical Republican representative in Congress.

Thanks to gerrymandering, your district is "non-competitive." Any Republican candidate is essentially guaranteed a win in November.

Therefore, your only electoral goal is to win the primary. Note: in the typical Republican primary, less than 9% of the voting public will participate.

You want to avoid a primary challenger, and simply coast to victory. To avoid a challenge, you need to:

1) Be a "good soldier" and do the bidding of your party leaders
2) Vote for elite tax breaks (and against regulation), to ensure the flow of big campaign contributions
3) Keep local partisans happy (you must wear a MAGA hat and kiss Trump's ... ring, or else they'll turn against you and promote a radical-right challenger)

Your job depends on raising money, being loyal to your party, and pleasing a few hardcore partisans (the ones who vote in primaries, engage the party faithful, and demand your ideological purity). You really only care about the handful of voters needed to win a primary. In November, the casual voters will reliably vote against any Democrat to ensure your victory.

What's the vulnerability that reformers can exploit ?

It's the tiny number of primary voters. When when only a handful of voters are needed to win a primary -- that's a big opening for outside intervention.

We will recruit well-known, respected non-politicians to run against incumbents in Republican primaries.
In over 20 states, Democrats and Independents can freely vote in the Republican primary. This enables us to oust a right-wing incumbent and establish a moderate as the Republican candidate in November.

This is just a rough sketch. To see this strategy in action, proceed to What's an Example ?