[atahanacar]

>they are using SNI filtering as well

This is surprisingly easy to beat using very funny methods, like splitting the request in the middle of SNI, or sending a request with a low TTL to an unblocked website first which gets dropped then repeating it to the correct SNI.

There are more methods all of which I find very funny for some reason. You can use GoodbyeDPI on Windows and zapret on Linux.

[dabacaba]

The disadvantage of those methods is that they require installing custom software, and they don't work on mobile devices unless you put them behind a router with custom firmware. In contrast, DoH works out of the box on most operating systems, and hopefully ECH will work as well.