Sounds like a classic bucketed card to me. Many people end up just closing them. They served their purpose of helping build your credit, but now you have better options. (Such as that Discover)
^ +1 My SO and I both opened new cards recently, but with different profiles and at different points in our credit journeys. Cap1 wasn't even on the radar for me, but my SO was looking to open their first cc w/ sl lates holding down their score. They didn't want to do secured or have an AF, so Cap1 Plat was perfect. We're not expecting any significant growth on the card, and it will be replaced when cards w/ more generous limits become open to them, but it's exactly the right card and the right lender for them right now.
Congratulations on your CLIs. But I think a bigger congratulations would be in order if you land a better, non-bucketed card, which you probably can pull off.