Missed the "close to six figures" on the original post. I'll assume you're a sole proprietor for the following, and you're making 90K net profit on the business, and that you have no employees and don't intend to hire any in the future, other than possibly your spouse. All of the figures that follow are for 2017.
As Telecaster mentions, you can use an individual 401K. The individual 401K limit on 90K of schedule C net income is $34,728. Which, if you max it out, is convenient - you're now under the income limit to deduct a traditional IRA. So another $5500 there. If you make more and cannot deduct the tIRA, then you're well within the limits for Roth IRA. Then, since you're providing your own health insurance (also deductible if you're self-employed), you can choose a High-Deductible plan and put $3400 in to an HSA.
So you've got at minimum $43,628 of tax-advantaged space for investments you could use. If you want to invest even more of your income than that, then a taxable account is a fine choice. Or real estate, or whatever you're inclined to invest in. If you want even more tax-advantaged space, look for an individual 401K that allows for after-tax (not Roth) contributions and in-service rollovers and do a Megabackdoor Roth.