Getting Started Again After 2 Decades

I'm posting this, because... well I don't know how to get going again. I've been doing tech for a long time; I've done operating systems, back end things, cloud things, security things... basically all the things. I've also only ever worked on closed source - and had contracts that prohibit things on the side - all legal in the jurisdictions I've worked in.

I've also never had a resume - ever. For 25 years jobs, consulting, and whatever has just worked out. It also means that I literally don't know what to do now.

I've moved to another country. There's no tech here, and no network to speak of. Remote boards seem to mostly be not remote, or "yeah it says remote, but we want you here". My other favourite is "oh, you're not American, sorry".

So how do you get started? How do you write a resume that matters in tech? How do you get people to even notice you anymore, or to grab their attention?

I'm now at wits end, especially with the collapse of worldwide markets.