Any point in contributing to my IRA if MAGI precludes deductions?

I cannot contribute to a Roth IRA and if I contribute to a my IRA, I can't take the deduction due to my household MAGI. I have a sizable amount in a brokerage account and wondering if I should contribute to the a Roll Over IRA I have there, or if there's no point, since I wont be able to be able to deduct it from my taxes.