Some extra notes on these. First, while your SE taxes will be higher to cover the employer side of payroll taxes (FICA), you'll be able to write off 21% of qualified business income (QBI). Also, if you run payroll (e.g., because you decided to get taxed as an S corp, possible even for a sole-member LLC), you can decide on a defensible salary and take the rest of your profits as distributions that aren't taxable under FICA.

As for retirement savings, if you make enough you can max out a solo 401(k), which can even be a Roth 401(k). This lets you set aside more than 10x the IRA limit, and can be in addition to the IRA.

Finally, if your health insurance plan is a high-deductible one that's HSA-compliant, you can set aside thousands more into an HSA where you can invest your money. Then, you can leave it there until retirement, adding each year that your health insurance meets the requirements - HSAs have a triple tax advantage - you contribute pre-tax dollars, the money grows tax-free, and withdrawals are tax-free if used for medical expenses (which all of us will have in retirement unless we die first).