You should contribute to the 403(b) at least to get your full employer match. then you can also contribute up to $7,000 (since you are over50) to a Roth IRA if you meet the income limits. For 2020, those limits are $196,000 if married filing a joint return. Above that income your eligibility to contribute to a Roth phases out.
If you convert your wife’s IRA to a Roth, make sure you have the money to pay the taxes OUTSIDE the IRA!
As for the last sentence, I’m working on that!!