The easiest way to tell is to compare your budget with actual search demand and your account settings. If you have budget left over but are getting few leads, the issue may be limited demand, tight service areas, restricted job types, or limited ad hours rather than your budget.
If your campaign is consistently using most of its budget and still has strong lead quality, your budget may be limiting growth.
Also check whether recent changes to your service area, business hours, job types, or profile have reduced your exposure. Comparing performance before and after those changes can help pinpoint the cause.
So, if you have plenty of unused budget, look for demand or account restrictions first. If you’re regularly hitting your budget while getting good leads, increasing the budget may make sense.