If you regret an undo it's nice to have a redo. Usually it's ctrl/cmd+shift+z and in other services it's ctrl/cmd+y (I prefer the first one, as it doesn't require two hands or strained fingers)

This is related, but not necessarily linked to the feature suggest for multiple undo's:
https://checkvist.uservoice.com/forums/2121-checkvist-web/suggestions/116119-multiple-undo-s