Is it possible to make money using your Linux knowledge if you're not a developer? I know I can become a professional devops or sysadmin if I take some courses and master advanced networking. But is there something I can do now as an average, moderately experienced linux user?
Typical onboarding scenario is to start at low level and climb up. Apply for helpdesk positions in companies with linux infrastructure. But the game is currently moving towards devops, so I would suggest you add some knowledge like ansible and terraform in your repertoire.