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Just to check have you confirmed that the reason you're having problems is because of an IP address conflict?
If your router is setup to dynamically assign IP addresses then this shouldn't be a problem. Can you connect to the router (usually something like 192.162.1.0 or 192.168.1.254) and see if it's set to DCHP?
Also before you start setting static IP addresses a a bit of a bodge fix have you tried clearing the phone's cache as detailed a bit lower down on the post?
https://us.community.samsung.com/t5/Galaxy-S8/Galaxy-S8-Wifi-Issues/m-p/252647/highlight/true#M10073
I am having the issue described here with my phone on my home wifi network.
https://us.community.samsung.com/t5/Galaxy-S8/Galaxy-S8-Wifi-Issues/m-p/193842#M10016
Can anyone translate the solution into a simple step-by-step guide even an idiot could follow?