Unlimited revisions are never a good idea. (100% money back/satisfaction guarantee are also very risky. It implies that you’re not confident in your work and attracts scammers.) Providing a very large number of revisions is fine, but unlimited is risky. (Noticed a review of yours that mentioned they did take a large number. How many was that? 15? 50? Might make a good bar for an upper limit.)
Your gig descriptions need to clearly differentiate what perks are part of which package. (If a buyer is confused, they’re more likely go elsewhere, rather than take the time to puzzle out what you’re offering.)(The first sentence in every gig should echo its title, to reaffirm what you’re offering to do. Window-shoppers have a short attention span.)
You should remove that ‘assignments’ offer from your electrical engineering gig. (TOS)
Always check your gig thumbnails from your profile. The text (size, font, color, style, location) needs to be readable. Several images have been cropped oddly. Shrunk images don’t always look as good as the full-sized. (These are usually the first thing people will see, and a poor first impression will drive people away.)
There are several small English errors in you gigs and your profile.
Consider adding your native language to your profile as ‘Native/Bilingual’
There are several formatting issues with your gig descriptions that make it/them look unprofessional.
Those ‘special deals’ are all expired, which looks unprofessional, and I would recommend avoiding that type of thing from within a gig altogether. If you want to offer discounts, the place to do that is in your self-promotion.