How to send CRM conversions back to Google Ads to improve campaign optimization?

I’m trying to improve the quality of data Google Ads gets from the CRM.

Tracking leads is easy. The harder part is sending back what happens after the lead: qualified lead, booked call, closed deal, revenue, etc.

A few things I’m trying to figure out:

What’s the best way to match CRM conversions with the Google Ads click?
Should this data go to Google Ads or through GA4?
Which CRM events are worth using for bidding optimization?

I’ve also been testing ObserviX to map website and CRM conversions and know which ones should be sent back to Google Ads.

Curious how others are doing this. What setup works best for you?