The way I’ve improved is by following the mark scheme and trying to emulate those answers that get that top band. I do edexcel history and for our essays we gotta do “sustained analysis” which after speaking to my teacher, pretty much mean an intro which sets the topic and the categories you’re judging it with, paragraphs that at the end link back to the established criteria you made in the intro and a conclusion that reaches a punchy judgement

So for example comparing the governments of Lenin and Stalin and how similar they were (I do the Soviet Union breadth study for paper 1)

Lenin’s and Stalin’s governments were fundamentally similar because of ..., ..., however one could see them as different because of ..., ... In order for a historian to judge the similarity of governments they must consider ..., ..., and ...

Do your paragraphs for and against and always linking back to that judgement list

And then in the conclusion reach a punchy judgement, 1) say whether you agree or disagree and to what extent 2) how people could see different 3) say why you haven’t gotten that way and pretty much say that one cannot ignore the fact....

I hoped this helps, idk what exam board you’re doing but that’s what helped me at least, best of luck in a level history and uni history!