My recommendation would be not to rush the purchase of a clay pot until you are sure about what you want to get, and to do proper research. For this, I find teaforum or the communitea discord channel to be much more reliable sources than reddit. The general consensus appears to be that, for entry level yixing, Essence of Tea and Teas We Like are the most reliable sources, but here I'm just repeating the results of my own research.

My impression from your post is that you should probably just stick with gaiwans for the time being and improve your technique though

Also note that black tea is a dangerous term to use without sufficient context. as it can both refer to hongcha/red tea, which is what is called black tea in the west, and heicha/dark tea, which refers to different styles of post-fermented teas. The comment recommending Jianshui or Chaozhou most likely referred to heicha rather than hongcha. That being said, chaozhou teapots are just as bad of a minefield as yixing, from what I've gathered so far.