My motivation came from life.
My dad was a hydro electric operator, the Dam he worked at had a civil defense shelter built into it. While visiting him on a graveyard shift he showed it to me.. The door said how many people it was designed for, and the stacks of food were impressive, C-rations, cans of water, medical kits, and other equipment to take on a Nuclear War aftermath. The thing was this was 1973 and the food was from 1950, I remember my dad pointing a a case of food saying I had that when it was fresh and it was bad then. The government builds shelters as an event and the walks away as everything is ready, but they don't maintain anything. Think of the rotten medical supplies that they pulled out and discovered was trash during the start of COVID-19. Back to my motivation to prep.
I was on my own at 17 and doing well, then when I was about 20 my income was cut drastically (~70% reduction) and I found myself walking to work (no gas money), eating Top Raman noodles (until it became too expensive), and just barely getting by (if you could call it that). That lasted for about 3 months until I could get a second job... (Food and water are job 1)
Then when I was older I was married with 3 children living in an all electric townhouse, we had a big snow storm and no power for 2 weeks. That was another short term event but it had different needs... (Heat, light, and the ability to cook are Job 2)
Today, we are comfortable but my wife relies on electric medical equipment. We have had several near misses with food recalls and I no longer trust the supply system. (Medical needs and Long term sustainability are job 3)
As I approach retirement my preps are designed around a simple plan: 1) 1 year's supply of the foods we eat every day, eat the oldest stuff first (First In First Out, FIFO) so the food is always just editable... 2) have a short term supply of emergency heating fuel, a way to cook, and electricity supplies to cover up to 3 months. 3) Develop a sustainable water, food, and power supply to cover a long term SHTF event. 4) Obtain the equipment and skills to securely maintain my supplies for external threats.
Most my SHTF events have been uncomfortable personal short term learning events that teach me what I will need, but in the world we live in we need to be prepared for the big events too.