There will be many, many people who find themselves in similar situations. I developed SaaS marketing operation platforms once (though for Print, In-Store marketing) and happy to have left the field. But career changes are hard, especially if marketing is your specialty.
With the huge amounts of adtech and marketing that is around (and part of what we now call ‘surveillance capitalism’) there is also a need, I think, for lots of insiders who bring change and transformation to the industry. Different mindsets, approaches, and ethics.
I created a discussion topic some time ago for brainstorming alternatives, that I recently gave another swing, and which you may find interesting: Humane advertising - ethical and mutual-beneficial: It is possible !