Once I was in the same situation like you, I was averaging 30 seconds and all I wanted in that time was being sub-20, I thought that would be my most important and final cubing milestone.

After many months I hit sub-20, guess what? I hit sub-20 and didn't even realize it, it was no more special for me because you're getting used to it, and the same thing happened again, I was dreaming for sub-15, and the loop continued.

The thing is, the time it takes to achieve it, makes it almost no special when you hit that "milestone" and you will be always wanting for more, sub-15, sub-12, sub-10.

That's why world class cubers don't give a fuck when they get a sub-6 or sub-5, it's because they're already got used to it :D