Contacts, start by attending any an all gatherings. Go to churh, parties, meetups any meeting that will let you meet possible partners and colaboradores. Make sure you get to know as many people as possible. Being in SF and sitting by the window will get you nothing.

make reels ,connect,invite people on social media to have a discussion brainstorming ideas,talks,technology,people

I was in a similar position around 1.5 years ago. What helped me was: 1. Reaching out to people on X sharing that i just moved, would love to meet with offering some ideas where i can add value. 2. 1-2 meetups initially via luma/partiful. Most of them are noisy but even if you meet 1-2 good people that leads to long term connections. 3. Signing up for hobby classes - Most of the people in SF are in tech so you end up meeting a lot of like minded folks. 4. Going to popular coffee shops/coworking to work. Serendipitous encounters are easy to happen here.

Good luck!