Our team uses https://backyard.co - it's free, has tons of really fun party games, and comes with built-in video chat. My favorites with large groups are Fake Artist, Word Scramble and Codewords
Make an io party game - the genre is super fun to create in, was growing rapidly before COVID, turbocharged during COVID and remains underserved. Growth is built-in because of inherent sharing. Use a game engine like Playcanvas so you can publish it to web and wrap it into a mobile app if you'd like (Unity is fine too, but doesn't work on mobile web, whereas Playcanvas works everywhere). Ads monetization is of course the quick route, but if you have the patience to add cosmetics and premium levels, you can make a killing from in-app purchases.