Octopuses need both your attention and some toys or objects of interest.
Not all octos show the same interest in toys, and some will keep objects as prized possessions - my bimac did this with the little bottle I gave her. It was a sturdy small glass bottle with a shell and some sand inside, also some water to weigh it down a bit. Insted of playing with it, as I had hoped, she took it right to her den and kept it there. I could peek in and see her sleeping with an arm around the little bottle.
Nancy