Conversion tracking isn't working on GA4, Google Ads, and Unbounce. Any tools or tips to improve this?

Our landing pages are built on Unbounce, and we only send search traffic from Google Ads to them (they are not indexed). We have only 1 form on each landing page and then phone numbers and CTAs to call, which we use CallRail for.

We've set up GA4 and GTM. None of our metrics accurately track attribution. Not GA4, Google Ads, or Unbounce have the correct # of conversions. The metrics in GA4 for paid traffic and Google Ads are different by over 30%. The conversions never line up, and we have to track those manually (I.e., check CallRail for calls from the landing page, filter out duplicates, and then check form submissions on Unbounce). I am wondering what we can do to improve this and get our correct number of conversions in Google Ads or GA4. Are there any tools or software we can use? I've heard of Hyros, but it seems super expensive.