In the past, I couldn't play any musical instrument, but after years of dedicated practice, I can now play the piano proficiently.

I couldn't swim nicely when I was younger, but now I can swim laps for an hour without stopping.

I had trouble speaking a second language before, but now I can hold conversations in different language with native speakers.

It used to be difficult for me to understand math, but after many hours of studying and practice, I can now solve calculus problems with confidence.

When I was younger, I couldn't draw anything beyond stick figures, but now I can create detailed sketches and paintings.