3 easy ways to get better at speaking English

Come back [to here – from where I am speaking]

Go back [to there, where the other people are waiting]

So, suppose you are on vacation in London. You are still there, but you’re already making plans to return one day, so you say: “I’d like to come back here one day”. But, if your vacation finished and you are already home, you say: “I’d like to go back there one day”

Another example:

Your sister lives in another city. After some time in your home, you say to her: “You should go back home.”

Your sister lives with you, but went to study in another city. You miss her, so you call her and say: “You should come back home”

head back: to return to a place from which you recently came

I walked to the end of the street and then headed back home.
This is far enough. Let’s head back.

(There’s a video here, where Adam explains 8 “head” phrasal verbs – including “head back”, so, take a look if you want)

get back to
1.(transitive) Return to (an activity)
I’ll get back to work as soon as I’ve finished this game.

2.(transitive) To return contact with (someone)
I’ll get back to you when I have an answer

3.to return to a place after you have been somewhere else:

If you get back in time, you can come with us.
When we got back to the hotel, Ann had already left

Well, I’m not an expert, but I hope I have helped you.