Statista is fairly straightforward to cite as the database has a citation built in. Use the blue quotations button to generate the citation.
Note that Statista uses the "Retrieved from date" since the statistics might be updated at a later date. Statista will also use the [Graph] as a custom format.
Morning Consult. (May 19, 2020). Level of interest in eSports in the United States as of May 2020 [Graph]. In Statista. Retrieved November 20, 2020, from https://www-statista-com.proxy.library.ohio.edu/statistics/1108266/esports-interest/