Wait for it.

If you can't wait,

F5 for prestige!

(Your real F5 button, if any, won't work)

Pure Idle (v.1)    Not-at-all Idle v.3

(This version of 'Pure Idle' has only one 'boost', which is a gain in 'prestige' when hitting the [F5]. Your 'prestige' adds to the rate at which the score increases. The overall speed you can increase the score is faster than in Pure Idle (v.1).)