If the tips I provided don't improve the battery life of your Apple Watch, there are a few other things you could try:

Update your watch software to the latest version. Sometimes updates can include improvements that help extend battery life.
Unpair your watch and then pair it again with your iPhone. This can sometimes help resolve any issues with battery life that might be related to the connection between the two devices.
Contact Apple Support. If you have tried all the troubleshooting steps and your watch is still experiencing battery issues, Apple Support can help you determine if there's a hardware problem that needs to be addressed.
I hope these suggestions help you resolve the battery life issue with your Apple Watch Series 7.
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