Newborn sleeping

Hello, I'm a FTM with a 3 week old. He tends to sleep ok during the day with awake windows between 1-2hrs but when it comes to night he seems to fight his sleep and becomes over tired leading to him becoming very upset. We tend to either take him for a walk in his pram, BF him, white noise, cuddle/rock which settles him and he goes to sleep but as soon as we place him down he wakes up again and it starts again. I know he's only 3 weeks but anyone any ideas on how we can settle/help him to self smoothe? I do wonder if he's getting too much sleep during the day. Please be considerate with your comments, I'm on tired and emotional mum 😊