I have had an Apple Watch since the original and never had it that bad. I think something is wrong with your watch.

Just a tip with Apple watches: get the battery service at least once during the lifespan of your watch. It's $99 and Apple gives you a brand new watch.

With that battery service the watch should last you about 6-10 years judging by the current status of my Series 4.

Yes, a watch should be able to last a lot longer than that, but I think if you're buying Apple products you already have the expectation of a maximum 10 year lifespan just from software alone with just about the entire product lineup.

You may have an app draining your battery. Was having the same issue with my watch, I deleted a few apps and all of the sudden my watch was better. I can’t tell you what app was because it was just luck. I was creating space on my phone when it happened.