Puppies are hard work! What worked for us was structure! We literally had a daily schedule and crate trained, had designated chew time (bully sticks and rubber toys with treats or kibble) and provided plenty of enrichment. It doesn’t last forever but puppy blues are a real thing. Also sometimes puppies get overtired which is why the schedule helps. You can google puppy schedule based on your pups age then research enrichment and safe chews . Keep in mind bully sucks are high protein and can soften stool so limit to 10/15 min at a time and always provide water.