In John 3:3 and John 3:7, Jesus uses the words “Born Again”. In 1 Peter 1:23 it is repeated and that passage ends with “for ever”. You can’t be “un-born”.
If one is truly born again one is changed to become a new person. That new life must be continually filled with new life works. It can languish for lack of substance. It can fall away by losing the fear of sin and the greater fear of God’s judgment. Works follow salvation but salvation without works is empty. That emptiness will be filled with the cares of the world, the sins of the world that lead to death.
So, yes, one can lose one’s salvation by failing to act on it. This begs the question whether or not it is possible to fail to act on genuine salvation. I do not know the ways of God’s judgement. I can only enter His tabernacle with fear and trembling, hiding in the cleft of the rock, of Christ, my salvation and only hope.