How does it get better after 12 weeks?

Pretty much what the title says… I keep hearing that it gets better once baby is older than 12 weeks. Can you please give me some examples and what to look out for? P.S. I have 10 week old LO and looking forward for 12 weeks mark for some ease. Currently, he is breastfed and supplemented with formula. He feeds 10-15 times a day sometimes and his naps are from 30-45 mins, if I am able to coax him back to sleep, he will sleep maybe extra 30 mins.. night times he sleeps about 9 hrs with 2 feeds in between. But there are nights where he refuses to sleep with gap more than 1.5 hrs. So really looking forward to what gets better!