Welcome back to the platform! Don't worry about finding a niche and don't worry about publications too much. Show up, write, publish, wash-rinse-repeat - build up some momentum and you'll find yourself building a following of lovely readers. You're likely to fall into a lot of traps, but don't worry - that's what we all did. It's an exciting part of the journey to be on and it won't be the last trap you fall into. Here are the next ones. :o)
https://medium.com/feedium/the-top-three-writing-traps-medium-newbies-fall-into-f3c870dbf402