“First get a reality check. Are you really earning less or is it just a gut feeling? If it’s re asdfadsf ”

First get a reality check. Are you really earning less or is it just a gut feeling? If it's real, try looking for a new job elsewhere & get a reality check there, too that you can earn more elsewhere. Show these other companies your sales record. Finally when you have an offer elsewhere you have grant leverage to get a raise .