Well the easiest way is to back off from the edge a bit. You’re driving too close to the precipice, my dear.
As great as it feels you don’t need a super hard edge to get denial working for you. Just play, get all hot and bothered but don’t try and ride the edge, or even get too near it. It’s much easier to stop when you aren’t pushing so hard.
If you always use vibes, try doing it without. if you know you can hump a pillow and feel good, but not cum, try that.
Get through a whole day with four or five ‘soft edges’ like that and you’ll feel the deeper, more pervasive impact. And as you push further, you’ll get the ‘denial high’ and suddenly cumming, and losing that, sounds like a lot less attractive option.
Let us know if that helps!