router hacked

Hi, in the close past i did have repeatedly massive issues with my internet connection, regarding speed and overall connection to the internet not working. After a while i did recognize a change of my IP, even or especially connected over my ASUS RT-AX88U VPN router VPN per WireGuard...

My pc and laptop are hacked along with my router, both have rootkits. Buying a new pc and router and configuring the router on a different network would be the only solution to this? I have very little knowledge with configuring a router would i be able to configure it myself? If anyone has...