Hello. As you may already know, there is an unofficial Lonarpg wiki . I believe it would be wise to promote it, even if it's unofficial, by giving an external link on fanbox, itcho and even at the game main menu if tolerable.
It would help veterans to explore the game fully and new players through the early stages of the game, probably increasing your sales
Additionally, you could make take full control of the unofficial wiki or make an new official wiki yourself.
That's is allunofficia, since after promoting, the community would just grow the wiki automatically.