"by myself" and "myself"

👓
to do something + by myself = emphasizes

the idea of "alone" and "without companionship"

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I like listening to music by myself. / I like being by myself when I listen to music. 🎼

After school, I walked home by myself. My friends did not accompany me today. 🐾
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👓
to do something + myself = emphasizes that you did it and not another person; you didn't need help or you didn't have help

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Today I had to make dinner myself. Usually I buy dinner but today the store was closed. 🌮

I had to clean the street myself. My neighbors did not want to do it. 😤