Are you starting with anything, nothing, good location, bad location. It's too broad of a question. People make this far far too complicated. Start with the famous Maslow hierarchy of needs and prioritize.
Going in order of priority:
1. Location. This is safe shelter and defendable shelter and community. This will impact your survival more than most things, probably everything. A person living in normal part of LA will likely not survive as long as someone living in normal parts of Kansas. Too many people, too much density, too much crime, too few rights of self defense in LA and if SHTF you're dead. A secure home should be something hardened and defendable in a safe community. A million dollar home should be a reasonable goal.
2. Water and food. Have several months on hand. I assume most smart people do this, but if not it's as important as safe shelter and community. Food and water supplies should have redundancies, including wells, water storage, livestock, food production and processing, etc.
3. A firearm, ammo, and training. Can be basic or advance. Defense, safety needs. Multiple firearms, tens of thousands of rounds of ammo, and significant training is the goal.
4. Medical supplies and training. A stocked infirmary with medical texts, videos, aid kits, medicines and surgical supplies and ample training is a reasonable goal.
5. Power production, tools, vehicles, parts, mechanical and electrical supplies and parts, and so forth to maintain a comfortable and safe power source, transportation, and safety/convenience of electricity, heat, lights, refrigeration, transport, etc. with fuel tanks, oils, and so forth.
These would and should consume huge amounts of resources and I think a person's first $500,000 to $2 million maybe $5 million in preps should be in these categories.
Don't waste your time on PMs until you have millions of dollars into these 5 categories or other well thought out categories. People who don't have all of the above first, investing in PMs, are living in a fantasy of trading PMs for things of value. Not going to happen.