It’s important to expand you vocabulary and learn new ways to say thing same thing. Instead of saying, “I’m tired” all of the time when you feel tired try:

I’m beat.
I’m exhausted.
I’m pooped.
I’m worn out.
I’m done.
I’m sleepy.
I’m spent.
I’m flat out tired.
I’m dead on my feet.
I’m running on empty.
I’m running on fumes.
I’m fatigued.
I’m tired out.
I’m weary.
I’m dog tired.
I’m tired to the bone.
I’m knackered.
I’m dragging.