Real credentials come from experience, not titles. And experience is mostly mistakes.
You don't even need much charisma or charm, just a dedicated willingness to contribute. You've already figured out how to do things that people would love to know how to do.
I'm getting hundreds of hits a day from people searching for advice on how to cook brown rice. What are my credentials? I ate a lot of rice. That's it! Millions of other people are probably much better at it than me. But I wrote the article, so Google says I'm the expert on the topic:
how to cook brown rice - Google Search
You don't have to be the best in the world to help people. You just have to be willing to put yourself out there. Simply share what you know.