While you may not have Adobe Photoshop to design a stunning cover or the editing skills for a cinema-style trailer, you do have the ability to write a killer blurb that'll pull people in and get them reading.
A good blurb tells potential readers who and what the story is about (characters/plot), sets the stage (setting), and establishes the story's so-what (the stakes). Usually they are between 50-200 words.
Here is an example of all that in practice for Lee Child's Killing Floor.
"Ex-military policeman Jack Reacher is a drifter. He's just passing through Margrave, Georgia, and in less than an hour, he's arrested for murder. Not much of a welcome. All Reacher knows is that he didn't kill anybody. At least not here. Not lately. But he doesn't stand a chance of convincing anyone. Not in Margrave, Georgia. Not a chance in hell." (60 words)
All the italicized bits are the four major elements of the blurb. We know the character Jack Reacher is ex-military and a drifter. His conflict is that he's been arrested for murder. The setting? Margrave, Georgia. As for the stakes, well, being imprisoned for life for a crime you didn't commit is a pretty compelling one.
An above and beyond element you can try in your blurb is using the language and style found in the book. Killing Floor has quick, cut-and-dry prose, just like that of the blurb. This will help your readers gauge what to expect in terms of style and presentation for your story.
Other techniques you can use are an intriguing opening line (or a pair of them) or a comparison sentence at the end of your blurb.
I used the opening lines (A heist gone wrong. A gang shattered.) and comparison ("Six of Crows" meets "Peaky Blinders") in my blurb for "NOVYYE SAINTS."
Asking a question at the end something along the lines of "Will Character A be able to do/get Thing X" is also a simple, effective tactic because it invites people in to start reading so the question can be answered.
If you're feeling adventurous or inspired after reading about these tips, feel free to drop your work-in progress blurb in the comments. I'd love to workshop it with you and maybe a fellow reader will too!