You may create a category just about him. You can put his pictures doing his favorite activities and describe them in a simple way. You can also finish the presentation with a praise for his focus and "hard work"
I remember my son's favorite slides were when I and/or my husband were kissing/ hugging him. You can even take a picture of him watching LR and add an encouraging comment.
If he's hooked again, you can reintroduce LR curriculum and keep just two or three custom slides at the beginning and the end of each session about something he did that week.
I hope this works