If your average income has changed recently, then yes, you can update your health insurance plan and you may qualify for a larger premium tax credit that could lower your plan price. You should update your health application immediately so your plan price may adjust for the following month.
You can report a change in your household income at any time by logging into your Stride dashboard or contacting your health insurance exchange directly.
Head to this page for state-by-state instructions on how to update your income on your application.
Instructions on how to calculate your income are here.