Great answers so far; I really like how short and sweet @Avery Carl kept it.
Any real estate strategy is going to be based on you and the "strategy" part itself. STR's will always exist; the question is will YOU (or your PM/team) have the plan to make yours work?
Prior to 2019, the STR market was really heating up; in many cases, it almost seemed to be a race to the bottom though in terms of who could offer the lowest price. Covid showed up on the scene, and almost overnight, more than half of those rentals disappeared from the STR market. Some switched to LTR and some sold (both ok plans if you can manage to not lose money).
We were fortunate that our ongoing strategy allowed us to operate at lower occupancy (and do some renovations) during the slow down, and then we were able to work to the top of the market for the folks who still needed to travel or isolate. I hate not to credit a good amount of luck on these sorts of things, but the point is that even in a global pandemic with no travel, the STR market was still a good one.
So to your actual question; the market is saturated in many areas, so you can either shop for a different market, or you can do what it takes to stand out and weather the storm.
Double "or" you could have a different type of investment strategy altogether.
Not knowing your current situation, I would say this:
You have one rental on the west coast, and you are planning to expand on the east coast. If you feel confident about your why and how then go for it (with an appropriate amount of caution (because I'm very cautious)). However, could you also add a few units in your local market (is that the west)? Use that expansion and learning opportunity to inform your strategy in new markets? That might be the option I'd look at, especially if you're feeling uneasy.