I agree with others sellers who said that deleting any gig will not affect your account. Absolutely it will not affect your account but the thing is deleting is not a best solution then editing. If you have a good good feedback on your gig then I suggest to edit not delete.. best of luck.
Wait for time. You will get success of course. Stay active on Fiverr, Send 10 offer to buyer daily, Stay active on Forum to learn new tips, Share your knowledge with social media.