[Svartalfiar]

You’re probably missing loads of deductions.
The sched C is important, obviously since that income is double-taxed (income tax and SS tax) but I usually have about the same amount on A and C.

I could be, but I don't have a lot of big-ticket items. My health/dental expenses are an eye exam and a box of contacts. Insurance (Tricare) is cheap and can go on Sched C. No home (buying one here soon though) so no mortgage interest. No student payments. Rent is a partial deduction on C for home office. Job expenses are C. I have some charitable giving but not several thousand.
Altogether it only added up to maybe $4000. (Sched C I was able to take off a good $1k or so.)

Any suggestions for deductions to maybe look for?

[Svartalfiar]

(Sched C I was able to take off a good $1k or so.)

Make that $12k. Much more tax savings!