If you are coming to the Fiverr Forum to gain insights on how to improve your gig or how to get more sales, you have to be open to the fact that your gig or your work might be criticized. People do not criticize to be insulting; they do it to help you. Instead, be grateful that they are taking time out of their day to help you when they have no obligation to do so.
Of course, we might not want to hear that we are doing something wrong, especially not if it is about something close to our heart (which our work often is). But, if you truly want to be successful on Fiverr or in life, you have to learn how to accept and apply criticism.
Do not get angry when someone criticizes your work, but use it to become even better. If you shut your ears to criticism and believe that you are already the best that can be, then you will never improve. I cannot count how many times my YouTube videos or games have been criticized (and with much harsher words than you would hear on the Fiverr Forum). But instead of crying about it, I used it to become an even better developer and creator, and I am still listening and learning every day.
I will add this great quote from the Bible that I think is good advice to follow (whether you are religious or not):
"Let every person be quick to hear, slow to speak, slow to anger." - James 1:19
To be able to listen, understand, and apply advice or criticism is, in my opinion, our greatest asset as Fiverr sellers. As a new (or old) seller, you have so much great advice that you can use to improve here on the forum. Use it to your advantage.
Never stop learning. Never stop improving.