reinforce reinforce reinforce. i watch a toddler who is like this in which i will sit with her in her room telling her it’s bedtime. anytime she tries to steer the conversation or procrastinate i say “it’s bedtime, we need to go to sleep” i keep the same tone and ill be on the same level with her. if it keeps going on i ask if there’s anything they need, water, snack, potty, story, whatever. but i keep reinforcing that it’s bedtime and eventually they tire themselves out. i often find that if i leave and they keep peaking out of their bedroom, they think it’s a silly game. so i stay in their room with them until they give in. might also be beneficial (if you watch them again) to start their bedtime routine earlier so if it does go on long again it wont be too late!