@SebastardMorgenstern
Proper spelling and grammer will go a long way toward improvement. Beyond that, greater descriptive writing will bring scenes to life for your readers. Take the time to describe where they are, what's around them, how they feel, what they are the thinking. Have them interact with their environment rather than simply standing still in a grey murk of undescribed scenery, reciting monotonous dialogue that is uncoloured by varying adverbs to change tone and delivery. Breathe life into them. Observe your own surroundings while you write and pick out things that you notice, and then translate these details onto the page.