getting baby back to sleep after transition

J
So my son wakes up after around 30-45mins. Every 6 month schedule I see says to start putting them down for two longer (1.5-2hr) naps and one cat nap (30-45mins) so I'm curious what methods help baby sleep past the transitional phase of sleep? He doesn't seem tired at that point and will not go back to sleep even if he was up for 2+hrs  😣