try to consume as much real spoken language as possible. Read not only fanfictions or books, but also try to find youtube videos that interest you/Twitch streamers. at least that’s how I did it.
I basically fell into learning it when my big brother started watching TV shows with their original sound and since I was hanging around in his room very often, I kinda learned it by proxy/simply had it in my ear for a long time.
hope that helped any