Playfull Hub

I think looking into his interests and most of the times they are surprisingly fun and playing pretend, if it is a specific show, movie, comic or book you can show interest and let him either teach you about them or just binge read/watch it, then it can easily become the base of your playtime. For instance I used to love Barbie so naturally, I used to love to play-pretend as characters from different movies with my friends and sometimes my mother would also join in and I still remember the games. and if he is not the playing pretend type even dropping references randomly can work well.