While sleep regression can be frustrating for the parent, it's also a reason to rejoice because it means your baby has reached another developmental milestone. Your baby is now cycling between deep and light sleep, much like an adult does. Since you've done all you could to help your baby sleep longer and wake up less at night, though none has worked, I would suggest to just keep doing what you do. Just put baby to sleep the way you did when he was still a newborn. He's simply adjusting - but knowing that the bedtime routine stays consistent, that is the routine he'll follow for years to come. So better to just stick to what you do, even though they're not working right now, so that when the time comes and your baby adjusts his sleep pattern again, it's really just the timing that's the issue but not the actual routine of falling asleep.
zinnamon