You could deploy your own: https://github.com/google/seesaw | how-to: https://render.com/blog/how-to-build-an-anycast-network

Or have someone else deploy it for you: https://www.vultr.com/docs/configuring-bgp-on-vultr/ | https://netactuate.com/anycast/

All big cloud providers have anycast load balancer offerings. In my experience, Fly's load balancer is wayy more simpler than those to use (because it is the only way to load balance, like with Cloudflare).