Buyers request are provided to NEW sellers minimum 2 times a day in “large” pile.
For every time zone is different.
I for some strange reason got them at night and I contacted CS with evidence after collecting evidence for a month and they changed my settings to European time and then I could see BR at 9 AM and 2PM, so only at those two times. If I refresh after 30 minutes I do not see anything. But that doesn’t mean there are no requests.
As levels 1 and 2 you get to see more BR and they do not disappear, but still you do not get to see ALL the BR available.
Fiverr gives a random amount to each random seller randomly.
You only see BR if the buyer listed that BR in the category you have GIG in.
Every seller has the right to send 10 offers in 24 hours starting midnight GMT.
So if you wait until 23:55 you can send 10 and then after midnight another 10.
Before it was 3 and 5 offer max so they increased it.