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What sorts of improvements are you looking to make? What sorts of troubles are you having? Logic? Coherence? Sentence structure? Spelling/grammar? Finding your own style/voice, cadence, inspiration, etc.? Are you talking about literary writing (books/stories), persuasive writing (essays), technical writing, other forms? There are many different directions to take your question, so details could help!

Like many things, getting good at writing involves both a lot of reading (observing others who excel at their craft, and picking up on what makes their work stand out), and a lot of practice (whether "forced", e.g., at school, or on your own). Having a concrete understanding of where you feel lacking can help you focus on what to improve.

(For what it's worth, your writing here, at least, comes across as coherent, directed, spelled correctly, with good cadence and grammar — it sounds like you're probably looking for higher-level improvements; but I don't want to assume anything.)