Here are some more solutions you could try:

1. Uninstall apps: If you have third-party applications installed, some of them might be consuming more battery than you'd like. This is because some apps can be poorly optimize, or just do a lot of work to function, which takes more energy.
2. Factory reset: Related to the first point, this will ensure there are no power-hungry apps left on the device.
3. Avoid the cold: Lithium-ion batteries, like those found in the Apple Watch, do not hold charge for as long when exposed to colder temperatures, especially when below freezing. Unfortunately, cold can also permanently degrade the battery.
4. Service the battery: Apple provides free battery changes for the Apple Watch, provided the battery holds less than 80% of its initial capacity. Do note that Apple does not fix batteries that "wear down from normal use".

If none of these work, the battery might unfortunately simply have gotten old. Batteries naturally lose performance as they age, and will eventually need to be replaced.
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