Looking for bedtime advice…

Hi Mamas! My baby is almost 4 months and while he is a fantastic napper, bedtime is a struggle. I’ve read so many articles and books on good sleep habits but can’t seem to figure out my little one’s issue. I pay attention to his age appropriate wake windows and sleepy cues all day to determine when to put him down for a nap. In the rare occasion that he is fussing, he self soothes without any intervention. He is also still waking once a night for a feeding and is often wide awake when I put him back in the crib, but I usually leave the room to pump and when I return he’s fast asleep. My issue is bedtime, once he’s demonstrating the same sleepy cues he does for naps I start his bedtime routine and he’s usually sleeping around 8pm. However, he will sleep for about 20 minutes and then wake up at minimum two more times screaming. The temp in the room is fine, he’s not wet or hungry, I’ve tried starting his bedtime later (as it was when he was younger) but then he’s overtired and it’s worse. Has anyone had this problem? We plan to sleep train and move him to his own room in a couple of weeks if the pediatrician gives the ok, but in the meantime I’m really trying to build good sleep habits. Maybe teething discomfort is worse at night? Maybe it’s just FOMO? Maybe I just need to be patient? I have no idea! Thanks in advance for any thoughts!