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So I saw these particles in a definition and a song.
First, as ひとりでに, which got translated as by itself (this got approved by the way) and then "単独にでなく", which I'm guessing means not being done in/by independence/singleness (I don't know the word 単独 by the way I searched up it's Japanese and English definition). What do these words mean?
ひとりでに is a lexicalized adverb which has its own entry in dictionaries:
You'll basically have to remember ひとりでに as a non-divisible fixed expression, and go on. The same is true with some fixed rentaishi such as 大きな; you have to remember this because it doesn't follow the basic conjugation pattern of i-adjectives.
単独にでなく is made of three words, and can be straightforwardly analyzed by the standard grammar:
So it just means "not individually", "not in an isolated manner", etc.
