My question is simple! How to get maximum (Possible) privacy from ISP in case someone can’t or don’t want to use a vpn ?
Fir example, In some case tor browser is enough for many but they still need from a privacy from isp on other activities on mobile.
Switch DNS to a provider that supports DoH or DoT is about the only thing you can really do.
Without using a VPN or proxy, your ISP is going to be able to do DPI and know what connections you make. There really is no way around that.