Of course, that's a major element!
That's one of the reasons why people will get in touch or buy from you.
It is because they place you at the top in expertise in the field they are interested in.
This is the major element.
How to give you credibility?
Show that what you talk about is real!
that you experience all that every day!
That it's not some vague distant theory you tune into.
It has to be real
+ you need to be the best in your field
or at least in the top 5!