I was getting better little by little, and by the end of it, I could skate quite fast.
I slowly got the hang of it, and I was able to skate around the ice quite quickly at the end.
ーI was getting better little by little, and by the end of it, I could skate quite fast.
「だんだん上手になって、最後には結構早く滑れるようになった」
to get better で「上手くなる」
little by little で「少しずつ・だんだん」
to skate quite fast で「結構早く滑る」
ーI slowly got the hang of it, and I was able to skate around the ice quite quickly at the end.
「徐々にコツを得て、最後には氷の上を結構早く滑れるようになった」
slowly で「徐々に」
to get the hang of it で「コツを得る」
ご参考まで！
By the end, I gradually got used to it and started skating faster.
By the end, I gradually got used to it
「最後の方では、段々と慣れてきて」
and started skating faster.
「そして、早く滑れるようになった」
"gradually" は「徐々に、だんだんと」という意味で、習得や向上のプロセスを強調します。"got used to it" は「それに慣れてきた」という表現になります。
カナダ 
アメリカ合衆国 
