Which are the best projects to showcase automation testing?

Hi peeps, I have started my career in testing. So far it was manually and one in blue moon, automation testing using selenium. However now i want to upskill my self, and create a portfolio for my resume. So which all projects idea i should do and technologies I should learn for switching? Open for other ideas as well

PS : please refrain from suggesting generic automation testing projects like Facebook login page etc. I am looking for something which has a ‘wow’ factor.