You are asking really late, it may be too late to make any changes.
If your income tax owed is expected to be less than $7500, the only way to get the full benefit of the credit is to get more income so you owe more tax. Because you are $2200 under the max credit, if there was a way to increase your income now by $10,000, it would be tax free, because the tax would be covered by the EV credit.
There are very few things I can think of at this late date that would increase your income for 2021.
1. Delay last-minute holiday charity contributions until 2022, so you pay higher taxes this year (which are covered by the EV credit) and then get the deduction next year. But it may be too late.
2. Do a conversion of $10,000 of your 401(k) into a Roth option 401(k) account, if your employer offers a Roth option. That will create $10,000 of taxable income now (which will be covered by the EV credit) but when you retire, you pay no tax on withdrawals from a Roth account (unlike regular 401k accounts where you pay regular income tax). It may take several business days for the Roth conversion to clear (if you are even allowed to do it) and if it doesn't clear until 1/3/22, then it doesn't count as 2021 income even though you might have made the request in 2021.
3. Ask your boss to pay any bonus you expect for 2022 before 12/31/21.
4. Sell some investments that have increased in value (stocks, gold, etc.) so you lock in the capital gains in 2021. If you want to re-buy the same securities, be sure to wait at least 31 days.
Other than that, I think you just left it too late to make a difference.
Or, if you didn't actually buy the EV yet, put it off until 1/3/22 and then start your tax planning earlier next year.
