Add bottom margin or scroll past last line in Mac OS Terminal
I here what you're saying however the only thing I know of is to use the clear command.  It keep's the history intact while returning the prompt to the top of the Terminal window.

I added an alias for clear to my ~/.profile file. Or ~/.bash_profile file if using it instead.

alias c='clear'


Now I just press CEnter.  Then scroll back into the history as needed.