[SOLVED] Only one port working for switch

[Staybegind]

Hello everyone,
So I have a small LAN cable in my flat.
https://photos.app.goo.gl/inw2kVyRcanzhvDA9
I used to connect a router (Linksys EA6300 AC 1200 Dual-Band Wi-Fi), but it limited my internet to 200 Mbit speed, so i wanted to connect a switch to it. I bought a tp-link TL-SG1005D, and connect the little cable to the 5th port of it. Then I connected all of my 3 computers and the router to the switch but only one computer receives internet. If I turn off the working computer another one starts working, but the problem is that only one computer has the connection at a time, is it possible to fix it the way i want?
Thank you

 

[jsmithepa]

You must: Modem ---> Router (NAT device) ---> Switch
Cannot: Modem ---> Switch ---> Router.

The NAT device MUST immediately follow modem.

If the router is indeed limiting you to much less than u paid for, even for wired connections, then the router itself must be upgraded