So far I’ve been able to ask the following subs to add links to various comparable Lemmy communities:

https://www.reddit.com/r/tycoon/ (I am a long-time contributor here)

https://www.reddit.com/r/adventuregames/

Don’t know if it makes much of a difference, but it can’t hurt SEO.

I’ve also reached out to the citybuilder subreddit, but they ignored my message.

Some other genre-specific Lemmy communities that are active (unfortunately, it’s mostly me posting, but not always):

Help out if you feel like it or you are a regular on a relevant game genre subreddit.