Campaign underspending or not spending budgets

The spend is determined by the amount of auctions you win, so your advertiser score needs to be improved. 

How do you solve this? There are many options to take into account when your campaign isn't running smoothly. Among these, adding ads which are more interesting for your audience, increase your bid manually, selecting a different event to optimise on and—if all of these things don't work—copy the campaign and opt for another campaign goal.