It’s fairly difficult from the other side as well - contributing. I’ve been trying to complete wikidata from a few open source datasets I am intensly familiar with… and it’s been rather painful. WD is the sole place I have ever interacted with that uses RDF, so I always forget the little syntax I learned last time around. I have some pre-existing queries versioned, because I’ll never be able to write them again. I even went to a local Wikimedia training to get acquainted with some necessary tooling, but I’m still super unproductive compared to e.g. SQL.
It’s sad, really, I’d love to contribute more, but the whole data model is so clunky to work with.