​I have marketing skills but no product. What would you do?

I’m a digital marketing specialist with experience in local SEO, web design, Google Ads, analytics, email marketing, CRMs, AI and automation.

My problem is that I don’t have my own product or business to sell.

I’ve been thinking about finding an existing business that already has a product/customers, but is outdated in marketing, tech or systems, and trying to partner with them to grow it.

Has anyone done something like this?

Thanks.