Reset bash history search position

There is Meta + >, which is bound to end-of-history and useful if you're in the middle of your history. The meta key is usually the Alt key.

If you see that your incremental history search isn't successful, you can use Ctrl + G, which is bound to abort and restores the previous line and history position.

Check the manual for more commands like these.

This may be a somewhat indirect answer, but I usually use Ctrl+c to exit the history search. This cancels your entire line entry, leaving you on a fresh prompt with no input on the line, and back at the end of the history list.