Can't turn off Do Not Disturb mode

Seems it is not enough to just tap Do Not Disturb...

we need to turn off the Focus that was set under Do Not Disturb.

Seems this is turned off in much the same way we turned the focus on.

ie: Tap the Focus that’s on to turn it off.

Use Do Not Disturb with Focus on your iPhone or iPad

Use Focus on your iPhone or iPad – Apple Support

Turn on or schedule a Focus on iPhone – Apple Support

says:

"Note: You can also turn a Focus on or off by going to Settings  > Focus, tapping the Focus, then turning it on".

JulijaG11 Said:

"hello, I have on iphone the "do not disturb" on and I cannot switch it off"

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Use Siri for this:

Use Siri to Increase the volume. Ask Siri: "Turn Off do not Disturb". Report back the results.

Go Here: How to Use Siri on your iPhone - Apple Support