Mitigating rising digital marketing / CAC expenses

Hi SF community

In most businesses I look at - not just ecomm - ad expense is the most material cost, the most volatile, and the most at the whim of external forces.

Invariably every business I look at with digital marketing has significant increases in costs over the last two years, relative to revenue, which I understand to be industry wide dynamic. In some cases, they have made recent changes (e.g., to new vendor) and projecting material pro forma improvements based on short run rate.

Obviously I have healthy skepticism, and am aware you can game numbers short-term While I am far from an expert, neither is current mgmt in most cases, and there are some obvious opportunities. I am generally pursuing in cases where I have ideas and applicable experience to reduce dependency, e.g. through expanding other channels..

I would love any stories - good or bad - on how ROMI / CAC has moved after recent acquisitions, and how you have mitigated (through DD or post-close operational changes), in order to have a more realistic view.

thanks in advance!