Currently located in wealthy area: looking for ideas that I can start in a week

I am located in Spain currently, in a wealthy area, and I will be here for another 5 weeks. Which service can I start here with minimal upfront cost? 

I started Meta ads campaign for Christmas/NY decoration, and got several good leads in 2 days, but they asked for instagram which I currently don’t have. 

As for my experience: digital marketing – Meta ads obviously, Google ads, SEO etc, and programming (worked as a programmer for years)

I am creative, I love problem solving and executing.

I was thinking about knives sharpening or cleaning, or other stuff like that.