Your trade set is gods-awful. I have 2700 less infra and I make about double in tax collection per day. Try going for a more economic-minded tradeset like the one that I have, at least for collection. Your trade set is very good for paying bills and buying infrastructure, but very horrendous for collecting taxes.
Why do you have a standing air force? That dramatically increases bills.
Why do you have standing Barracks/Factories? If you have more than 49 improvements, your improvement bill goes way up.
Are you collecting taxes every day? You better not be. Check yourself, before you wreck yourself.
1. Get about 10 days worth of bills
2. Put up 5 Labor Camps
3. Pay bills for 8 days
4. At 10 days inactive, tear down Labor Camps, put up economic improvements
5. Get temporary trades for economic resources
6. Collect epic tax collection
7. Restart your regular trades
8. Either use the profit to do a mass infra purchase, buy a wonder, or do another sled
inb4destro