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ctually the Agile Method can be perfectly use for a single developer. Yes you will be missing your team mates, but apart from that the method and the process are practically usable.
You can for example use Epics and User Stories to break down your project into a logical smallest possible part. And then you can list them in the back log.
You probably won't do a Stand-Up meeting, that would be weird to do it on your own, but you can still do the Sprint.
In addition, you can also do other methodology like TDD (this might already built-in to your programming language) and even Continuous Integration (depending on your stack).