How we can ask for feedback?
You don’t ask for feedback.
If you search the forum for ‘ask for feedback’ you will see results from other experienced sellers advising not to do so - and complaints from inexperienced sellers who did ask for feedback, and who received an account warning for doing so.
Thank you for your advice
You don’t ask for feedback on fiverr. It’s better to develop your skill. If you provide good service then you get good feedback from Buyer.