Singing Hands UK have a great YouTube channel with lots of videos grouped by theme in playlists, with songs and stories.
They also have a "topic" section where they add groups of semantically-linked vocabulary, to build Makaton skills.
Alongside their songs for little'uns, here's an example for older students from their "Carpark Karaoke" videos:
https://youtu.be/IpA7q2SIh2o
Sing Up have some sign language and Makaton clips available here:
https://www.singup.org/singupathome/sign-language-makaton