One of the best things I did recently was setup dnscrypt-proxy locally. Most of the Indian ISPs just do transparent DNS proxying and dns-crypt helps avoid those. Lots of them do DPI on HTTP requests, so HTTPS-everywhere helps as well.
Similarly in the U.K., Potasto2 is a good solution to this kind of filtering. It sets up a local vpn server that allows you to customize DNS servers and proxy settings without added latency of a remote VPN (but of course without the added benefit of encryption.) It's the only way I've found to use non-ISP DNS servers on non-jailbroken iOS when connected to a mobile network.
In the current scenario this would be illegal to circumvent in most cases so if DoT puts block, don't try to circumvent even if it is possible. In India the law situation pretty bad so.....