Hardly a professional, but here are my thoughts. Could be wrong about them, but here we go:
First, I'm going to go off of your request of writing something that is memorable. I'm not going to say this is general writing advice, just to help with that specific question.
Now, if that is the goal, the way that I would go about it is to make sure it come from you. There are other ways, but I believe that's the most reliable one that doesn't rely on 'be a prodigy writer' or 'get lucky'. It won't ensure it becomes memorable to everybody, but to some people, it will touch and affect them. This is assuming that everything else, at the very least, doesn't take away from the story itself -- so, you know, good grammar, decent language skills, characters that don't make people tear their hair out...
As for what I mean about 'it needs to come from you', I mean it needs to have themes, or ideas, or emotions that are things you personally experienced.
Here's a few examples that I could do to help show what I mean:
I have ADHD and ASD -- this makes for a very frustrating life for me. If I write a story that explores those issues, my experiences with them and what it's like to have a brain that betrays you, then those that have experienced similar things will be able to expand their understanding of their issues from my writing.
I firmly believe that people are, innately, good, even if they have trouble expressing this. I could write a tragedy about the struggle of people to do the right thing and understand each other, explore what it means to be good, to show my thoughts on it. I can make a thesis and defend it, and I've spent a lot of time thinking about it, so I can defend it very well.
I have a fair amount of talent and knowledge with regards to coding. If a story had that as a primary theme or as an element that regularly comes up, I can write it realistically enough that any editing or mistakes I make will most likely not require major rewrites -- and, on top of that, I can make connections and come up with ideas that others wouldn't. Competence, I find, is interesting to read about in its own right.
Beyond that, in general, when you write, try to draw from your own feelings. Don't do something like 'oh everybody has the love interest react this way so --' No. Stop. That is a decent way to fill in your gaps, replace what you don't know or you haven't experienced, but what you're going to be doing is rewording another's story. Which will require something else to help keep it memorable.
Finally, I'm going to note, again, something I've already mentioned. This will not make it memorable for everybody. It will make it memorable for people who can connect with your experiences that don't get chased off by the rest of your writing.
Somebody will always get chased off by something in your writing. Too much description, too little, should be in first person, should be in the present tense, whatever. To mitigate that requires more technical writing skills. It won't ensure that everybody will read it, but it will let more people do so -- and then, you can try to catch them with writing what you know.
(This is probably part of why romance is so common -- it's such an essential part of the human experience, so everybody can write their own experiences there!)
(Except for me, because I am aromantic, so the 'romance' part of stories never hit right!)