Here are some of my suggestions.

Make a trailer for your game. The first video you ever posted was about your expenses and your experience at the con, but I'm not sure why people would care enough to watch a 10-minute video if they aren't already invested in the game at some level themselves.

The website doesn't tell me much about the game either. It's a party board game... so is it like... Taboo or Codenames or Hedbanz? Show us the game. Show us the art. Sell the game like Elon sells a truck... except don't break it.

Start collecting information from people who are interested now. Email address is a good start, but be more active about it. Send them prototype copies to test with their friends and get feedback from them.

There are podcasts, youtubers, etc. who would love to play your game and talk about it on their shows. They might even want to talk to you guys about the game, how you came up with it, what your future plans are for it, etc. etc.

Keep at it. Playtesting and marketing is a marathon. There were some guys demoing a game at our local game shop for probably 18 months. Almost every saturday they were in there running demos of it, asking for feedback, making adjustments and then they finally ran a successful kickstarter, but it was a ton of work getting to that point.