All,

Thank you for the advice and recommendations, and apologies for not providing more information. As you can see I am a bit of a noob in terms of component replacement or selection. Next steps:

New chain, cassette, and front cage for now, stock components. I got bored watching the storm coverage and checked the chain and it is marginal, and cassette is worn enough to maybe miss shifts. Let's see how this works.

In terms of cables, any particular type other than basic bike cables and a Park cutter and stretch tool?

My goal - no racing, but I do like to use the bike for Centuries in the NYC area. Speed is less of an issue, but rather smoother shifting. This is NOT a "make it go faster" but rather a more pleasant ride with less "klunk" in the drivetrain.

Again, thank you for the advice and forcing me to think more - any day where I can reduce my ignorance is a good day!