So many variables.
I generally follow a low volume plan and add more “extra” riding, it makes more sense to me to follow a plan and add more volume, than commit to a higher volume then stress that you either have something that has cropped up and i have to delay. Or not being able to ride for fun and its not in the plan and might impact the next few workouts. If i unexpectedly have 45mins or 1hr45mins il scale up/down, or head straight out on the gravel bike after a workout to create a longer workout.
Volume, speed, and speed at volume appear to be the agreed predeterminates of going faster. But, it depends what you can comfortably schedule. There is not point in saying you need a minimum of 10hrs per week to go fast when you can only do 5. Do 5, then add extra as and when it allows.
I have found with myself a correlation of a long ride and improvements in everything. Obvious i know, but the perceived gain is tangible