my router was unplugged, now no body except me can join my server

two days ago my server was working fine, then my router turned off and my internet didnt work so i unplugged and plugged it.
as i know when you unplug or restart a router it changes your IP Address so i tried to redo the ports the same way i did them before, and it didnt work. people couldnt join my server since.
i checked my server files, and even opened a new one on the same computer and it still didnt work so the problem is with the ports and not the server.
my firewall is turned off anyway, does anyone know how to deal with such a situation?.

(User was banned for this post ("Wrong section. Go to the Help and Support section next time." - Kiwi))

same for me

It wasn’t at first, it got moved but don’t worry a ban here is a warning. Wait the ban out and then you’re free again.