@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.
@sam
You can setup openwrt firmware on your router, if your router supports it, then setup DoH.
Link: https://openwrt.org/docs/guide-user/services/dns/doh_dnsmasq_https-dns-proxy