I think both are important. Amount of time and followers. I first started writing on Medium back in 2020 with just 1 followerer. I wrote one article, which got many reads over time. I never planned to become a writer then. Just encountered a problem with computer and wanted to help anyone else with same issue. I forgot about Medium for many years and last month became a member. I now have over 150 followers, which I never thought I could get as I don't have a very big social media audience. We never know what we can do until we try. Don't give up.