Selfishly, I hope you do stay in digital marketing, and be the change I want to see. Ad-tech needs some sanity and reality checks, and I hear a rumbling in the deep around ethical advertising practices.
Ad-tech is not just feeling more manipulative by the year, it's also feeling more and more like snake oil to your average business. I feel like there's a niche opening up for honest feeling, more simple online advertising networks.
The issue with me being the reality checker is that I am considered 'negative', 2 years down the line after I'm long gone and reality bites, I look like some sort of messiah. Damned if I do, damned if I don't.
Doing my SEO volunteer work with small shop owners in the UK during lockdown opened my eyes. As you said the average business is hammered with SEO, PPC, growth tips (snake oil) to the point you have to try it. But they don't have the time so it's half baked mostly and they feel disheartened. Honestly, ad-tech is nothing more than going to the casino and thinking you can win against the house.
This is something I will ponder on as it can potentially lead me down the path of improving digital marketing without banging my head against a wall! Less talking more doing as they say.
There are heaps of SaaS platforms out there (from my last point of reference there were 2000+ MarTech companies, I would guess double that now) that focuses on; A/B testing, email marketing automation, customer success tools, heat mapping and much more. They have funders who want their returns, one way or another. Which then leads the marketing team of the SaaS to develop growth hacking articles which startups tend to absorb.
As a marketer you are backed into a corner of having to test everything because there are so many articles out there showing us how A/B testing a button from 17px to 18px increased sales by 50%. Or this genius new AI content tool that can swap things around for each and every user to match up with their purchase intent. It's gambling. There is data and some poor calculations that lead you astray hoping for that quick win. You will also find that one 'unicorn' SaaS will also dictate the UI/UX for the vast majority of others out there, look at Intercom which basically has been cloned in design across the board.