I’m assuming you’re talking about VO2 Max, and I have the same problem. It is ok to drop those intervals by 5 to 10% as Chad says in most of the workout text (I believe this also is mentioned on a recent podcast episode). This allows you to build up that part of your engine over time. I have a major weakness with these too, so I’ve dipped them down for now and will build them up as I recognize my improvements or if I’m just having a better day.
I also found I wasn’t fueling well enough throughout the day and that really helped me a ton in having the energy to complete some of those more demanding sessions.