Without trying to be unkind at all, I must say that anyone who offers Promotion & Marketing Services, yet has to ask how to engage in Promo & Marketing is not exactly reassuring
Welcome to the Fiverr forums.
You only have 4 minutes of read-time shown in your forum profile. Check out the Tips For Sellers category (with filters applied → forum.fiverr.com/c/Fiverr-Tips/tips-for-sellers/l/top/all?order=views). You’ll find hundreds of threads offering advice on a variety of things to consider and/or improve. (Note: Not all advice can apply to all gigs or categories. Be sure you check multiple sources as there are some false tips, even among the top threads.)
It takes a lot of work to make it as a freelancer, so be sure to research and plan accordingly.
“If you fail to plan, you are planning to fail.” (Attributed to Benjamin Franklin)