Just off the top of my head.
Submit to a radio or TV company and get accepted (including local radio and regional TV such as STV).
Create a Patreon where people can subscribe to your sketches.
Create an advert for a product or service and get paid - obviously can't be too derogatory.
Be accepted on a freelancing site for a comedy sketch job.
Get paid to have your sketch on NewsRevue or similar comedy show.
Befriend a comedy actor who performs sketches in front of an audience and send them material.
Create a sketch show for the Fringe and make a profit. (Please note this is not very likely)
Create affiliate content using your sketches? Possible, I s'pose.