Is there any way to promote my script?

I want to know what options exist so that my script has more diffusion.

i don't know...maybe dribbble, behance, instagram, pininterest and other similar websites?

Promote it on a blog where you regularly post useful articles for your target group. Then Google will send you people who are potential buyers.

I think that product pricing is also important. People who are willing to pay a higher price need to convinced even more with testimonials, a perfect website, a presentation that sounds well even for native speakers (and without typos) and so on.

Just some ideas.

You may promote at social media websites ......... like facebook, twitter, pinterest, linkedin, g+, reditt etc