You may find a different style of pedalling helps, especially if you are fairly old (40 or 50 plus), using your glutes with a push forwards pull back style as explained
on this thread. I am 57. I have found I have gone back to speeds I achieved about 10 years ago by using push pull rather than quad-centric stomp stomp. I don't think it would result in increased speed in younger riders though, maybe. I am not sure.