How can I imporve my writting

I can improve by more checking my work or think more because I'm not checking my work and think more idea. But I think I'm not good but I'm more batter than last year because last year I can even write 100 or 200 words but now I' need more improve I can write more than300 or 400 words. I think my personal narrative is very boring because I tells lot of moment and there is not many dialogue. If mt grammar is wrong I tell teacher or ask my mother to ask what is wrong and how can I change.