My iPhone 6s won’t get connected to a specific wifi even after resetting my network settings

In case it is only this one Wi-Fi network, did you make sure that your device is not blocked by the router?

If this is not your Wi-Fi network, ask the Wi-Fi administrator to check their settings.

See this Apple article: Use captive Wi-Fi networks on your iPhone, iPad or iPod touch

https://support.apple.com/en-gb/HT204497