You have to do hardcore gig research first. Go through Fiverr policy, gig selling rules and instructions. Optimize your gigs and profile based on your niche.
People are talking about this " less impressions" issue on the forum now, maybe this issue is related to the recent update. My gig impressions are lower than last week now.
My gig impressions were 0 from 26th march due to their server maintenance, after 28th march it came back to normal. It's maybe a glitch just wait another day and check again, otherwise you can always contact fiverr support.