Hey,
I work quickly and efficiently, because I understand that time is money for a business. And for me too.
First of all, thank you for the detailed description of the work. I wish all employers to state their tasks in this way. With respect, I will try to make my request as well.
About me: 5 years of experience, 100+ websites, worked on all platforms (WordPress, Magento, Shopify, and custom websites). Certified expert. I know gtm, GA like my 5 fingers and even better. With WordPress I feel like a fish in water.
My plan is:
1) Make an audit
2) Combine properties of GA and GA4. There is no problem using them together.
3) Clean up all unnecessary scripts from your site.
4) Move everything to Google Tag Manager. So the speed of the site will increase and the convenience.
5) Configure events for Google Analytics and Facebook
6) Set up conversions
7) Deal with CallRail.
I also want to note that quality work pays well. You have as many as 5 websites and this is a laborious job. If you want to get a quality result, you need to understand the price of the work. A good house cannot be worth $ 100. And if, all the same, someone offers it to you, then there is some catch in it, isn't it. Choosing me you choose a professional who guarantees the result of his work.
Price = Quality