Chuck may not effect much change, but dude surely understands how to hold power. He wins his elections and he has moved up the ranks in DC. I don't think he's a good Minority Leader, but he certainly can be a good Majority Leader.
In general, I'm not for primarying existing officeholders, especially in the Senate. My hope is that Schumer is ready to retire when his term expires in a couple of years. (What if Dems can retake the Senate in 2026 and give him a last 2 year run as Majority Leader, after which he graciously retires for the future of the party...that's a really nice bow on his career, no?) If he retires, i'd be perfectly fine with AOC running to be the new Junior Senator from NY. Heck, I'd be ok with the party leaders using AOC as a way to encourage Schumer to retire in 2028. But I'd struggle to support a contested primary there because I think it'd risk using lots of money and energy - and creating intraparty conflict - for a seat that Dems are almost certain to win. An important note, though, is that I'm fine with 2026/2028 AOC running for that seat, but I would not have been nearly as excited to have her run for it in 2018/2020. And the difference is that AOC has grown into her current position and moved away from some of her early PR moves toward actions that support the entire party.
Jasmine Crockett would be very, very smart to learn from AOC about how DC functions and how to build a career as an effective politician rather than as a social media star. Crockett could very well "inspire young voters, black and Hispanic voters" and have no realistic chance in a state-wide election in Texas if she turns off a lot of folks in the suburbs across the state. She's done a good job creating name recognition for herself, but IMHO she's got a lot to do to prove that she can be the kind of candidate who will have a long and impactful career in DC, especially trying to do so from a red state like Texas.