So few ABDL hypnosis files make use of fractionation or inductions other than progressive relaxation.
One of the most sure-fire ways to make someone go deeper into hypnosis is to re-hypnotise them, which is what fractionation is. It can be as simple as "In 3 seconds you'll open your eyes..1..2..3.. Eyes open.... Sleep! Back down deeper", or slightly more complex with something like a Vogt Deepener.
Then there's the distinct lack of confusion or shock inductions. There's an induction by I think Fiona Clearwater (Cant remember it was a while ago) where they have you try to remember 7 items at the one time and then once you hit 8 the command is "Sleep!". A mix of confusion and shock induction.
A pure shock induction might be like the start of BambiSleep where its just silence and then its the jarring "BIMBO DOLL" trigger. Just replace that with "Sleep" and you've got a decent shock induction over an audio file.
Progressive relaxation just wont work for some people, and it takes ages to do. We've got files these days with inductions that last 15 whole minutes when really there should be options for something faster once a trigger is conditioned in. Hypnotic Mist does other stuff well, but it only mentions the "Hypnotic Mist" trigger suggestion in one part and then doesnt reinforce it at any point. Giving the suggestion and then conditioning it in with fractionation would work a treat I reckon, then have subsequent files (or an edit of an existing one) use a shock/confusion induction using the trigger.
These files dont need to be an hour long if you just set the listener up to go deep quickly and then bash out a few suggestions and visualisations. I've more to say but I'd like to know whether others share my thoughts.