Here are a couple of YT shorts videos that might be useful:
Video 1
Video 2
Personally, one of the best platforms right now to self-promote your game is Tiktok, but it is **very** time consuming, because the algorithm requires you to post basically at least once every day. For general purposes, Youtube and Reddit are usually a very safe bet. Try to find which platforms your players use the most, and focus on that. Don't invest in a random Ads campaign without researching first if you can reach your audience that way.