baby won't settle during day. recommendations ?

♡ 𝓚𝓪𝓽𝓻𝓲𝓷𝓪 𝓵𝓸𝓾𝓲𝓼𝓮 ♡
So my baby boy Jacob is 3 weeks old and he sleeps through the night needing 3 feeds, usually in this time I change his nappy (diaper) and settle him so he sleeps and that is when I then sleep after putting him back in his Moses basket.
Recently though after his 8am feed he just stays awake and you can tell he is tired , his eyes get heavy and he does start to nod off but then wakes himself up for no reason and gets cranky and cries.
I know he is having a growth spurt but surely there's something else I can do to help ?
During the day is when I get my jobs done so it seems abit difficult when he is crying and only stops when someone is holding him.
I don't want him to rely on cuddles to sleep otherwise it's a bad habit to get into
I'm still learning I'm a single mum and this is my first baby + I've only been given advise from an antenatal class as I've had no proper experience with a baby before just babysat my sisters friends baby who was 6 months old 

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