Cat entertainment suggestions

Our boy is home alone ~3 days/week while we’re in office.

Leaving the toys out / self moving toys / iPad with sensory videos are not engaging to him anymore.

He’s an only child and getting a companion for him is not feasible for now.

Was wondering if anyone has any suggestions on how to keep him entertained while we’re away?

Might be a stretch - I was thinking of connecting a 2-way CCTV with video so that he can see us too (he likes it when we talk to him via CCTV). But I’m still trying to find a trustworthy brand that has 2-way video too.

Would greatly appreciate any suggestions!:)