I've studied English for about a year now, but I feel I've made little progress.
I started studying English a year ago, but I've made less progress than I expected.
It has been a year since I started learning English, but I haven't made as much progress as I'd hoped.
「伸び悩む」は英語で「to make little progress」、「to grow less than expected」、「to make less progress than expected」といいます。
「Expected」は「期待していた」という意味です。
I've studied English for about a year now, but I feel I've made little progress.
1年ぐらい英語を勉強していますが、伸び悩んでいると感じます。
I started studying English a year ago, but I've made less progress than I expected.
1年前に英語の勉強を始めたが、伸び悩んでいる。
It has been a year since I started learning English, but I haven't made as much progress as I'd hoped.
英語の勉強を始めて1年が過ぎたが、伸び悩んでいる。