[What's wrong with my gigs?]

In my opinion, clicks appear to be more favorable than impressions, and a high conversion rate should ideally be achieved based on the clicks. Continuous improvement is essential in this regard.

[Why very difficult for new seller to get order?]

There can be so many reasons. 

[Problems with getting new work]

As a video editor myself, I would suggest if you are really interested in this field and you have already searched about the things, pros and cons, and future challenges of video editing, then you go ahead. Listen to what your heart is saying. 
It required a strong machine, graphic cards, and much more things you can search for. And a constant process of learning with room for improvement all the time. 
In the future, you will be required a bigger screen for a big and comfortable display to edit the stuff quickly.  
It can also take you time to learn the modern techniques of editing but if you are really into it. You can do it quickly and will be successful. 

[What to do to get more orders ?]

Just now, donnovan86 said:

Stealing ideas from others to improve your stuff, not really. I always went with the idea of innovating and trying to come up with stuff myself. I know a lot of people copied my profile, but they disappearred over the years.

We are concerned about ranking and being active. I certainly never copied anyone, especially now. Maybe I am very lazy visiting others for the past few years.

For beginners, I would suggest that visiting others' profiles is not about stealing ideas but getting the motivation to create their own ideas and come up with their own identity. Whoever reading this, please remember that being original is a great thing. 

[What is worse? A bad review or a cancelled order?]

That is a very unfortunate situation for anyone who faces it. I would suggest you cancel the order if you want the sustainibilty for future orders. A negative review can be more dangerous than the Cancellation ratio and its side effects (which can be recovered in the future). The negative feedback will keep you hurt whenever you will see it on your profile. 

[What to do to get more orders ?]

Just now, donnovan86 said:

You started getting impressions because you updated your gigs. Not because you were online. Fiverr doesn't factor in how much time you spend online, so they don't care if you stay online for a day, week or months without stopping. You're wasting your time and not theirs.

You are right about it. My point was not being online all the time, but being active on the platform in any form you can. Update the gigs and your profile, fast responses, keep looking at other profiles to improve your's.  Let me know if I am right. 

[What to do to get more orders ?]

Just now, donnovan86 said:

That doesn't offer any success. I've been herre since early 2014 so around 10 years. I am on Fiverr only when I receive orders and deliver, or when I read the requirements. Other than that I am offline. And guess what, buyers don't care. They care more about your reviews, track record, how you talk with them, etc.

You are right about it. But the first step is staying active, improving and maintaining your services is the best practice for beginners. I personally lost all my ranking for not being active for 2 years, and when I back online and updated my gigs, I started to get my impressions gradually. Maintaining reviews and being good with the buyers is the next step. Only a dedicated hard worker can keep everything in control.