Tips to increase my tax refund for next year?

I am single & use a standard deduction so what tips do you have for me to lower my tax & increase my federal refund.
I cannot make charitable donations because they only work for itemizing..
I live in las vegas so i dont worry about state tax.

Contribute to 401K and take advantage of other pre-tax payroll items (ie. cafeteria plans, FSA)

If you are not on the company’s retirement plan, you can contribute to a Traditional IRA account which would be deductible

Also, if you are investing on your own, then seek qualified dividends and long-term capital gains, tax rate is 0% or 15% depending on your income.