Ever since I changed roles I'm rarely autofilling anymore.

Appearantly jungle and mid are extremely popular. Which means that if you choose one of them as your primary, you'll most likely get your secondary anyway or get autofilled.

Well now I changed from jungle to top. People rarely ban Darius so I can just play him almost every game and abuse his overpoweredness while at the same time getting a feel for the champion. Even better, when I get jungle and I ask for top it's actually not even that unlikely that I'll get it because people just seem to hate toplane.

So unless you are a die-hard jungle or mid main, just switch to ADC, support or top. Much, much less stressful in my opinion, at least once you've figured out how the role works.