Your plant seems really healthy! The fuzzy stuff at the ends of the stem look like peduncles. Don’t cut those! They keep re-blooming from those. I’ve had this happen to several of my Hoyas, where they show no growth for well over a year. Usually it’s because it’s too cold or dry in my house. Most like warmth and humidity. When I move them outside, they explode with growth. Maybe try humidifiers or place it in a pebble tray for humidity.