How to set up more than 100 Mbps network on keenetic?

Question

network hardware

500 Mbps speed comes from the provider, ~ 350 Mbps is available on the router via wifi, from the router there is a wire for a 1000 Mbps switch, further along the devices, but on devices, whatever you say, 100 Mbps via ethernet (gigabit network cards too)
found in the router here on the picture is like this, but if I put 1000 then the Internet does not work at all, why and how to fix the situation?

Answer 1

but if I put 1000 then the Internet does not work at all, why and how to fix the situation?

Because the connection cannot rise to gigabit, and you have explicitly banned the rest. Both NICs negotiate 100 Mbps. Why? Apparently because of the patch cord, it is either 2 pairs, or long, or twisted-trampled. Buy a Category 6 Patch.