My personal opinion, based on many contributors who joined the community in the past: please share something you already have, and look at the feedback from the community. This is a very valuable indicator if it is considered as useful by a certain part of people (newbies, investors, developers, …)
Some contributors shared their content here in the forum. Others on their own websites, on github, or well known blog mediums
e.g. just today New article: Unraveling the Myths of Cardano’s Nomenclature
Some contributed to https://cardanowiki.info or created stuff like https://antipalos.github.io/cardano-calculator/
and much more.
The feedback is very useful to improve (if required) and also to let someone nominate you. I guess/hope multiple independent (and not self) nominations are the best and sincere way.
Other community members can evaluate much better if your contribution comes from hearth to enrich the ecosystem by sharing what you believe know, or if it’s a strategy to evangelize others with your predefined opinions.