Welcome to the Make community!
You’ll need to have a list/array of RSS URLs, and then Iterate over those URLs in an Iterator, then insert the value into the RSS “Get feed items” module.
This is just an example. Your final solution may or may not look like this depending on your requirements.
Hope this helps! If you are still having trouble, please provide more details.
— @samliew
P.S.: investing some effort into the tutorials in the Make Academy will save you lots of time and frustration using Make!