"It is appropriate for the recipient of G‑d's kindness to do the same for others in need. It is therefore customary for a person who recites the Hagomel blessing to also donate money to communal causes." (source)

"Chayyim is a fine memory-aid for this blessing, because Birkat Hagomel is fundamentally about surviving brushes with death, and the profound awareness and gratitude for life that such moments bring to us." (source)