baby fighting to sleep

Yeah it’s been my journey for the past 5 months. He was worst at 2 months, but got a bit better at 3 months. Now 5mo still fighting but we r used to it, no longer stressed out by his cries, just persist in pacifying him, carry and rock. There will be a time when he will eventually tire out and suddenly droop his eyes and fall asleep. He does continue to wake up after 20min. But we just try to put him back to sleep again or if he’s really wide awake then we just let him play and put him back to sleep again when he’s tired. Tried to stick to a routine but too stressful if baby really cannot do routine. So just do whatever works