Marketing Mix Model - ROI and budget allocation

I am doing a project where the goal is to develop a marketing mix model and then answering to these questions:

1) What are the most profitable channels?

2) If the client gives us a total budget for Q1 2023 of +20% with respect to Q4 2022, how would you suggest using this budget? How would you do?

I would need your help.

Here is how I approached the project so far:

1) I wanted to calculate ROI from each …

budget client datascience marketing project questions roi