First step is to simply recall all the great memories you have, then jot these down randomly as ‘one liners’ on your Smartphone notes page:

Next step is to arrange these in the order you prefer, chronologically, by species or whatever.
If you have kept a fishing diary you will be able to put more meat on the bones: my diary recorded date fished, peg (s) fished, time fished, bites, weather, water temperature, height of river whether rising or falling, baits used, method(s) used, fish caught, weights of best fish (if any).
Ive got about three thousand entries to go through, but obviously will only select the memorable ones for my Bedtime Book