LAN Connected but NO Ping to Router

Have you tried rebooting the Mac?

Try connecting while booted into Safe Mode.

Also, are you sure all traces of "speedify" are gone? You mentioned "deleted/uninstalled" which are two different things. "Uninstall" is using the developer's uninstall app to hopefully completely remove all of the app's installed components, but many times may still leave things behind. "Deleting" an app will only remove the items contained within the app bundle, but not any files the app may have installed into system areas of macOS or maybe you meant you manually searched through the whole Mac looking for bits of the "speedify" app and manually deleted the items you could find. Customized network settings could be one of them. Does macOS even display within the Network System Preferences GUI the customized parts of low level configuration files when they are manually edited from an app or command line?

Hmm, a prefix of 24 = 255.255.255.0

If you temporarily change Configure IPv4 to: Automatic, and restart your Mac, can it access the router now?

If so, then try changing Configure IPv4 to: Using DHCP with manual address. Then enter the IPs as desired. Still work?

If so, then before changing to Manual, double-check that your router is not configured for MAC address filtering as John Galt has eluded to.

"speedify" may have altered proxies or other settings. Click the "Advanced..." button to find out. Other settings are likely to be managed by the router, so you may have to reset or reconfigure it.

You probably don't need it, but Change Hardware settings in Network preferences on Mac.

Interesting that you chose a class B address for your subnet mask. This would provide you with over 65000 hosts on your local network. Did you mean to use the class C subnet mask of 255.255.255.0/24 instead?

Show is the image without hiding the IP Addresses. What happens when you use DHCP rather than a manually assigned address?

Why are you hiding your local IP addresses?

Addresses like 192.168.x.x are not accessible from outside your local network. Everyone in the world with a LAN has the same addresses.

24-bit block10.0.0.0 – 10.255.255.255 class A network

20-bit block 172.16.0.0 – 172.31.255.255 class B networks

16-bit block192.168.0.0 – 192.168.255.255 class C networks

Not if the router is configured for MAC address filtering, among other possibilities.

I'm not interested in arguing with you. It's your router.