Yeah, it's hard to build anticipation when we've seen nothing (aside from some promo images from ETERNALS). SHANG-CHI, from what I've heard, has a pretty solid "action flick" hook, so that will help it.
ETERNALS could be a harder sell, as I've yet to hear anything noteworthy about its pitch that would set it apart from any other "team"-based comic book movies we might have seen already. I have heard it's the first big love story in the MCU, where that element is supposedly central to the plot, not just window dressing, but I can't see that, alone, getting most MCU die hards terribly revved up for it.