Lots of advice for pitching your game to publishers and building long-term relationships as a designer in the board game industry (videos):
What designers should know about board game licensing contract terms related to advances, sub-licensing, and free or discount copies (video):
https://www.youtube.com/watch?v=bUteKCkWGxc
See also: https://cardboardedison.com/reports
Board game licensing contracts explained: What designers should know about terms related to creative control (video):
https://www.youtube.com/watch?v=0ZQXPN-yzPc
See also: https://cardboardedison.com/reports
Notes on advances in licensing contracts—specific wording to watch out for:
https://twitter.com/KevinWilson42/status/1566140701603151872
Post-pitch discussions with publishers: game designers discuss how to handle long waits for a response and more:
https://mojo-nation.com/chasing-ghosting-and-feedback-inventors-discuss-post-pitch-follow-up/
Should you pitch your board game design to publishers or self-publish it? Some pros and cons of each approach:
https://boardgamedesigncourse.com/should-i-pitch-or-self-publish/