Instead of "then," you can use words like "subsequently," "next," or "thereafter." For "after," alternatives include "following," "subsequent to," or "post." Each of these words can help convey a similar sequence of events or time.
a or an
you can use or , otherwise, or rather than.
next
Like
hard
Forefather?
peter
spectacular
athletics
demonstrate, employ, illuminate,
You can use: manage and succeed.
Lumber or timber.