You don't seem to understand how ideologies work. Ideologies have beliefs. And if they constantly compromise on those beliefs, they stop being an ideology.
"Christians should compromise about Mohammed being a prophet if they want to attract converts" is a terminally dumb take. That's also the logical conclusion of you take.
No, what you do is you show the advantages of your ideology, then you work together with similar enough ideologies to get stuff done (this is what a political party is). The issue the Republicans had is that there's a mismatch in ideology between those who led the party and those who made up the base. Those in power kept compromising away until they were too far removed from those not in power.
Meanwhile, the left has gone insane. This has driven many dems into being more republican. The issue is that the conservative big tent political party is in the end stages of an ideological war, one the moderate/RINO/unipartiest have nearly lost (your last hope is if Trump loses, but even then you probably lost).
So given you don't actually have a moderate option, and people have radicalized, they don't need your help. You need their help, in fact.
If you actually think megadeath was a moderate, I got a bridge to sell you.
The day Megadeath left I played kool and the gangs celibration on a loop for 3 hours.