Trying to figure out bra size help? I have measurements

I'm going to jcpennys today to get some new bras. I've been wearing the same old big bras for years and I'm trying to get some that fit well. We don't have a Victoria secret near by so I can't go in a get fitted there. And I don't know any other place that does them near by.

I've measured my bust and band but everywhere I look online it tells me I need to buy completely different sizes. I did measure with the best fitting bra that I had.

My underbust/band measured at 34.5"

And my bust measured at 41"

An example of how I measured myself⬇️

And Of course I'm going to try them on before I buy them. I would just appreciate it if anybody knows a good range of bra sizes I should look at. I'd rather not go in the fitting room with 20 different bras😅.