Hi @Frenchie, I'm copying some excerpted info from @CHfather's Basic Non-Busting Info, which I consider to be a particularly invaluable resource, below:
Batch has recommended what he refers to as a “redneck” approach, in which hyperventilating with room air is alternated with using pure O2. Read more about that here: https://clusterbusters.org/forums/topic/4919-batchs-hyperventilation-red-neck-bag/
Stay on the O2 for 5-10 minutes after you have aborted the attack. For many people, this holds off future attacks.
Many people find that drinking caffeine or some kind of energy beverage as they start on the O2 significantly improves their abort time. More on caffeine/energy beverages below.
People find different ways of breathing that work best for them. I have mentioned Batch’s suggested hyperventilation strategy as one example. In general, you should be inhaling deeply as you begin, holding the air in your lungs for a second or two, and then deeply exhaling, to the extent of doing or nearly doing a "crunch" to force out as much air from your lungs as possible. Looking down toward your feet as you use the O2 has been shown to help with aborts.
Caffeine/taurine. For some people, caffeine alone can help to stop an attack or lessen the severity of the attack. Some folks keep strong coffee on hand for that purpose. Some folks use caffeine pills, and some people take taurine pills along with caffeine pills. They take those pills at the first hint of an attack, or a couple of hours before a predictable attack time.
Many use energy beverages. Because some ingredient in energy beverages in addition to caffeine is believed to help with attacks (believed to be taurine), many people use those. I recommend energy shots (such as 5-Hour Energy) at first sign of an attack. Shots are quick to drink down and they have more caffeine than energy drinks, such as RedBull, that are much larger. Many people say the shots work best for them when they are as cold as possible. For many people, energy shots/drinks don’t keep them up even if they drink them at night. In addition to all the “standard” energy beverages, some people like “V-8+Energy” drinks.