Ask HN: Where to start to get back into philosophy?

Throughout highschool I had read many of the Greeks in my personal time and then in college, I had been introduced to a mix: Descartes, Kant, Hume, Locke, Spinoza, Nietzsche, Camus and lightly Chomsky plus a smattering across various schools of thought in certain classes whom I honestly don't remember. It's now been about 6 years and I feel like I often run into discussions online where people have a wealth of knowledge from certain authors and it makes me feel ill-equipped to engage.

What are some reccomendations to both round out my knowledge and also move the needle forward?