There are many parts to this:
Raising taxes - sure it helps revenue (tax everyone at much higher rates including Cap Gains). The issue with cap gains, people will wait it out especially with Real Estate and other less liquid asset classes.
Cutting spending - this likely helps a bunch more BUT people will suffer. Less SS, less Medicare, less Medicaid, maybe we cut Amtrak, maybe we cut tax credits, maybe we cut defense spending (what happens in Asia/Europe and does it really matter)
Increasing GDP - likely helps more than raising taxes and cutting spending but much harder to do. Best way- inflation with decreased spending thus GDP goes up and revenues YET overall government spending goes down.
Decreasing tax write-offs for companies and individuals. Talk about major shake-ups and tons of legal waste BUT it is likely needed on many fronts.