This domain name can be used to run a profitable Freelance Marketplace like Fiverr.com, Upwork.com or Freelancer.com where sellers (instructors) can provide MS Excel Related Services to buyers (students).
A user (student) can create an account and browse courses, save favorite courses to wishlist, add course to cart and purchase, start learning from his course page, and interact with instructor by messaging.
An instructor can create and manage courses from instructor panel, interact with students by messaging, and manage his earnings from the backend instructor panel.
An admin administers everything from the admin backend panel, approves pending courses for sale, pays course price commission to instructor, etc.
As you can see, ExcelGig.com has a strong profit potential and the ability to attract more traffic to your site.