Combat ostentation during worship

Ward off Riya during the act when someone sees you by thinking that what they think doesn't matter; Allah matters. They are like animals or children; they don't benefit you in any way.
Make sure not to stop the act, keep at it like you intended from the beginning.
Make sure that if you increase in worship, it's only due to the removal of distractions and motivation of others, but test yourself to make sure.