How to fully track the user and the effectiveness of advertising?

Question

contextual advertising

Good afternoon, situation: there are 2 sites, an online store and a regular one (where a form is filled out, and all stages of the transaction take place through CRM).
We developed these sites, the client asked to set up analytics and put forward the requirements:

1. so that advertising is measured in ROI or in the money brought in, in order to understand how effective his advertising is. Accordingly, we must bring together all advertising networks, goals through the site and CRM
   
2. create a profile for each user to see how many touches were made with the client, how much money from advertising was spent on him
   
3. compare different advertising options with each other in order to understand what converts better
   

if the first task can be solved using the standard functionality of Google Analytics, but even that is not always, I think, suitable only for an online store, then all subsequent ones are difficult, because. immediately there is a need for integration with CRM.
We spread it out like that, we understood. that points 1 and 3 can be washed down quickly on the knee, because there are understandable sdk and not so difficult to do, but how to find a solution for the 2nd point is not yet clear.
I wanted to know who and how solves these problems? interesting for both ecommerce and sales through crm.

Answer 1

If I'm not mistaken, then https://www.kissmetrics.com just knows how to track this thing out of the box.
If you want to play with GA, then you can make reports by User ID there, summarize all the data in your CRM, build reports from your database + GA.
How much money is spent on a user, you still can’t count in any way, because. advertising systems do not provide statistics (expenditure) for each click.

Answer 2

You can make a drawing of this scheme and put it as background;
You can also try doing this with a margin (create 8 divs (7 boxes with text and one with an arrow) and align with margins, etc...)