Looking to improve my 04 Honda Accord?

To start, I'm a delivery driver. I average 30-60 miles a day. Got my car at 184k miles and it's up to 193.5k. Whoever had it before me took damn good care of it, and I haven't had to do much except my power steering. The only non-stock part I have is a short ram air intake.

Before I started delivery I was averaging 23-25 mpg, and since then it's dropped to 19-21mpg (with all my stop-going). Especially with an aging car that I need to keep running, what would be the next step for an upgrade? I'd prefer an emphasis on fuel economy without sacrificing power, or if possible to boost both.

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