Not Spending Budget - Is It Because The Account Is New?

A client wanted to run a short and sharp campaign of 4 days with a budget of $1000.

We're half-way through the 4-days and the campaign has only spent $80!!

Audience is broad (millions). Have tried a few things to try and get it more active but to little avail so far. I have just turned on AI Audience which I never would normally do, so hopefully this will help things.

The Ad Account is brand new, set up by me last week. Is this why the reach and spend is so limited?

I have plenty of experience with Facebook Ads but this is the first time I've launched such a short campaign with minimal time to learn.