Sure, but it’s difficult to say without knowing the account structure. If you need to double at the current budget, that would mean halving CPC (and in turn CPA), doubling conversion rate, or some area in between. This would require you to really dive through the account to identify wins and pain points among targeting parameters, campaign structure, bid settings, devices, ad schedule etc., and acting on them.

If you are able to increase budget and the client is satisfied with the current CPA, look at Impression Share. If it is very low, there is typically room to scale while maintaining the same CPA by simply increasing budget.