You can also use one of the web cron services. If you don’t have access to a web server or are on a big host that doesn’t give you access to a Control Panel then these are great. Actually, I might recommend using them in place of the cron on your server anyway since their GUI makes it easier to set them up. Plus: If you end having to run lots of tasks automatically they have APIs that allow you to quickly add very specific tasks. It’s pretty awesome.
https://www.easycron.com/
https://www.webcron.org/
https://www.setcronjob.com/