Contacts you know and companies you’ve worked for before are usually where you start.

It can be a bit hard to kick off, but being semi retired could help.

Yeah to echo what was said, I would start shaking that network tree you built while working for 4 decades. I would also put yourself out there on sites like LinkedIn (I know, I know) that have groups for people looking to hire consultants or are ones themselves. There’s an online niche for everything these days.