Goodbye...
Goodbye is an important word, we must say it, but

how about using a different word.
Here are other ways to say goodbye:
Bye Bye
See you later
See you soon
Talk to you later
I’ve got to get going 
I must be going
Take it easy
I’m off
Later!
Have a good one
So long
All right then
It’s getting late and I’ve got to go
 
>Business English / Formal Goodbyes<
Goodbye
Have a nice day
Have a good weekend
Have a good vacation
I look forward to our next meeting
Until tomorrow
Until next week
Take care
I’d better be going now
I enjoyed seeing you again
It was nice meeting you 
Say hello to your family for me
Keep in touch
It was nice to see you again
 
>Slang Goodbyes<
Catch you later
Catch you on the flip side
Peace
Peace out
I’m out
I’m out of here!
I gotta get going
I gotta roll
I gotta hit the road
I gotta head out
I gotta jet