You got some really nice citizens. Two Tax Collectors(worth 300k alone) and a few Nurses(worth atleast 20k) as well as lawyers(30k) and a politician(15k)! Now if I were you, I would begin to work through the undesirable citizens. Single Criminal with no extra stats and addicts can be converted into Sick Citizens who have tax refund. I avoid converting plural citizens because you will lose 1 population. If you don't mind the loss of the extra stats from your criminals, there is a lot of potential for additional tax refund since your base income is over 9000.