[What I noticed in my impressions decrease and why "Fiverr 3.0" is actually a good thing]

I am agree with your statement to some extent. The reasons of down grading can be many such as,

- Low demand for our service on particular day. 

- Disappearing our of gig in search for service due to no activity.

- Making changes in GIG may also influence the appearance for some days.

- Remain absent on fiverr for some days.

These factors also affect the GIG performance for some time. 

[What should a newcomer do after create a GIG?]

You should wait till certain time for gig to land buyer. One week is not enough time for orders..