Anything marketing itself as a "volume booster app" that requires a subscription is a complete scam.
The volume coming out of the physical speakers on your phone isn't intended to be particularly loud. If you could turn it up to be audible in a busy public place, it would be extremely annoying for other people. Headphones are the answer. Earbuds are convenient, but a decent pair of dedicated wired headphones will sound better and probably be louder.
I recommend audio technica ATH-M30x's. Pretty cheap and durable and sound excellent.
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