@sam Can you change on your router settings DNS resolver? Set it to Cloudflare's 1.1.1.1 or Quad9's 9.9.9.9, your ISP shouldn't be able to see your requests.
@nikolal
When I'm using data, I'm not connected to a router and 1.1.1.1 supports DoH (encypted DNS) but the router should support it too. I'm not sure about it, do any of router support it?