What age can your kids be "bored"?

My LG is 2.5 and she gets bored, but needs my husband or I to stimulate her and then she'll play by herself for 15-30 minutes. At what age should we stop intervening and just let her figure it out?

We are a screentime family, but it's on for 2-3 hours a day intermittently, and usually in the evening when I get home from work.

EDIT: Thank you so much for all of your advice and experiences! I realize I was the problem and would jump in without giving her a chance to find something to do. I've bookmarked so many ideas and cannot wait to try them!!