[Sudden impression of all my gig become 0 on 1st July...]

It's because your gig out from different searching algo. 

Sometimes it happens when your gig active but disqualified because of quality [as Fiverr suggested]. If your single gig disqualified it affects on whole account gigs, and they all disappear and kicked back to the end of searching pages.

It's Fiverr end bug. 

Normally gig disqualified/qualified 2,4,8,18 date of every month.

Excepting wait, no solution.

[Fiverr's Support of Ukraine]

War must be replaced with love and peace.