Goodbye is an important word. We must say it, but how about using

a different word.
Here are some different ways to say goodbye:
Bye Bye
See you later/see ya later
See you soon/see ya soon
Talk to you later/talk to ya later
I’ve got to get going/I’ve gotta 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 ya 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