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Don't know how you have been trying to update the README but there is an action that is specifically built to update it that you can use. It is called dockerhub-description.
I personally use Github Actions for everything and don't rely on DockerHub as I found it takes longer to start the builds than actions do. Docker has even written an action just for building and deploying images, which you can check out here.
With regards to watchtower, it depends on what you are looking for. The best feature with it is that it can auto-deploy when it detects an updated container. Another alternative would be diun which only sends a notification if an update is detected and requires you to manually pull the updated image.
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