I still see some ads for things such as games on Xbox but I can't say I have seen as many as I used to.
I do believe Xbox is still as popular as it has ever been but with its die-hard fans at this time. They need to do more I feel to reach a wider audience.
Xbox has lost a ton of players, if you look at PS5 sales vs Xbox sales, it's almost 3 PS5s to 1 Xbox Series X sold. The only thing keeping Xbox going are it's loyal fans like my nephew, he is a diehard Xbox and refuses to get a PlayStation.
P.S. I think the only thing keeping Microsoft Xbox going is sales of Games on PC and PC GamePass. Because there are way more PC game players than there are Xbox players.