New contributors come to contribute. Conflicts arise, thus rules are needed. People who enjoy rules tend to win arguments, geting a kick out of it, while losers feel miserable. So far so good. Normal churn of editors occur, but with time dynamic above leads to old crew / good rules players to stay, while more idealistic people who care about rules less tend to drop the project faster. Thus with time old guard becomes a problem - they feel skillful enough to control the process and perversely get enjoyment mostly from moderation /rules application process, not from actual content contribution.

My solution for this problem - force old guard to retire. I.e. you can edit Wikipedia for X years. After that you are banned for life.

Would that help?

(obviously, enforcement of this rule is not trivial, but that is another problem).

How are the two sites not remotely in the same market? They are literally knowledge bases. Albeit, Golden is focusing more on structured data similar to Wikidata.org and Everipedia.org is focusing more on blockchain related content first with the backend using smart contracts/token incentivization.