300k per year for a few years is just not that much money. It's a nice boost but let's not pretend it's rich or wealthy.

IMO taxes should be on the rolling average of your income so two good years does not mean you get taxed as if that's your steady state

It’s 1099 income, not w2 income. You often need to buy your own non-group health insurance, in addition to employer payroll tax contributions.