I think it could be discouraging to focus entirely on net worth in the event of a down market - why not change your thinking slightly and create a goal based on the amount of stock purchased, or the amount of money invested, rather than the value at the end of the year?
For example, you could have a goal to fully fund a 401k (18,000), an IRA (5,500), and add a chunk of money to a taxable investment account (10,000) - this goal isn't affected by as many outside factors. As long as fund purchases/allocations in these accounts follow your investment policy, then you can be happy about reaching your goal and following your plan, no matter the actual value of the funds.
If side hustle income is variable, maybe you could have a goal to smooth out the variations as much as possible? Maybe do some outreach, or advertising.. it really depends on what type of work it is - maybe ask for referrals? If your goal is to increase side hustle business, then the end result should be a higher net worth!