Any recommendation on how to make the e-commerce world find you? And especially the large ones ?

I was thinking about scouring the web for e-commerce sites with bad performance and just send them a cold email with some simple actionable items.

Unfortunately my experience is as an outsourced employee so not too relevant for pitching as a contractor.

But product managers are usually pretty happy to hear you out and usually benefit from referring people they've talked to. And they respond on LinkedIn.

It shouldn't be too hard, contractors were common, employee turnover was significant too. Platforms like Salesforce Commerce Cloud usually have an API that supports an older version of JavaScript so employees are a bit harder to retain and a lot depends on contractors. That's why I suggested that particular platform, plus it's easy to find their customers if you browse the SFCC customer stories.

I realize it sounds like a terrible job after the above but I truly enjoyed my years there even though the quality of the websites varies a lot.

My experience with e-commerce sites is they they tend to accumulate enough tracking and ad network scripts to ultimately kill performance.

It's really quality vs quantity. Some really utilize whatever analytics tool they use, others just throw in more tools. It's a bit of a hit-and-miss industry in terms of code quality. Even the big ones.