[codegeek]

"but I'm not sure where to go from here. I don't know how to take my knowledge and transfer it elsewhere or what my future career looks like"

Don't think like this. You learned how to build resilient software over a decade. That can be applied to any company with complex software needs. Fashion industry experience is not relevant and doesn't mean you cannot work in another industry.

Focus on your strengths. Make a list of your achievements. You probably haven't done this for a long time if at all. If you can solve problems, you can find a job at a company that could use your skills.

"should I take my opinions and start a company where I solve this company's needs in my own way and offer it to other companies as a SaaS"

That is a whole another discussion to have. Starting a company is no joke (I run one). Also be careful about starting in same industry as your current employer because there could be potential legal issues that you should be careful about.