If your goal energizes you, and you're happy with the progress you're making, that's fine. But if you really want to optimize, you are exactly bass-ackwards. To maximize your path to FIRE:
1. Stop prepaying on the mortgage. You are getting only a 3%-ish return, AND lowering your potential tax deductions (assuming you have enough to make it worth itemizing).
2. Max out your HSA and 401(k) right now. That allows you to (1) obtain a higher return by putting the money in the market, where (2) it will grow faster because you do not pay taxes on it until withdrawal, and (3) you get to decrease your income taxes, because 401(k) contributions don't get reported as income. And (4) when you FIRE, you can use any number of withdrawal strategies to take money out with little to no income taxes, so all that growth is tax-free, not just tax-deferred. That is a win-win-win-win.
3. See if you are eligible for a deductible traditional IRA (since you are covered by a plan at work, there are income caps to be able to deduct the contributions). If you are, save as much as you can in IRAs for you and your SO as well. Same benefits as (2) above.
4. If you still have cash to invest, put it into a 529, if your state provides a tax deduction for doing so. Worse comes to worst, if you don't have enough to pay for college when the time comes, you can decrease your contributions to (1)-(3) above and let all that money continue to grow tax-free for four years while you divert the new contributions to the college.
1 and 2 are critical. The key is the power of compounding: the dollar that you put away right now, today, for your retirement is the most important dollar you will ever invest -- and tomorrow's is more important than the day after tomorrow, and so on. Rule of 72 says that if you get a 7% return, your 'stache will double about every decade. So if you have $10K in the market today, in 10 years that will be $20K, in 20 years, it will be $40K, and in 30 years it will be $80K. But if you spend the next 10 years paying off the house, you only have half as much -- you miss an entire doubling, just because you waited to start investing.
Note that putting the money toward the mortgage doesn't work the same way: your house will be worth whatever it is worth in 30 years regardless of whether you have 1% equity or 99% equity. Sure, you'll carry your @3% payment longer, but you'll be making @$7K on that money, so your net worth will increase much faster by focusing on your investments first.
The bonus is that because the 401(k)/HSA contributions come off the top of your income, you can contribute more money to your investments than you can to paying down the mortgage. Say your marginal state-and-fed tax rate is 20% (totally making this up). That means for every dollar you earn (up to the max), you can put an entire dollar into your investments. OTOH, if you divert that money to the mortgage instead, you can only pay $0.80, because you pay down your mortgage with post-tax money. So again, you make progress much more quickly throwing that money at your tax-protected investment accounts than you do focusing on the mortgage.
In any event, great progress over one year -- good luck and keep it going!
