louder not better
Strictly speaking from a volume/apparent loudness standpoint... The way those other tracks sound louder is probably thorugh a combination of expertly (or not) applied eq plus compression. What you're likely referring to is the "Mastered Sound" that is often the scourge of diy home recordists.
Many, many other factors are going to come into how loud a song sounds, like the techniques and gear used while recording and the quality/balance of the mix... But just adding eq and compression is not going to help in itself.
What you might try, simply as a quick fix, is using a GOOD compressor to add about 3 - 5dB make-up gain but using a slow attack (30-200ms) and a fast release (0-100ms) depending on the material and the compressor... fiddle with it for a while. The slow attack will allow "punchy" (possible speaker damaging) attacks/transients through while compressing the surrounding material...
THEN, go in and add some limiting to the top (set the threshold to) 3dB - 6dB.
Assuming you start with a track with natural dynamics, like -20dB RMS, you ought to be able to squish out 6-ish dB of apparent loudness, at the expense of your dynamics. Which will sound quite a bit louder.
Go easy on the compression ratio, max 4:1 on the first step and maybe MAX 10:1 on the second... the lower the ratio the closer it will sound to the actual recording (and better and more natural).
BUT, having a good mix that you eq properly (compare to pro records) will help a whole lot more than ANY compression (it will even seem "louder"), but the overly-compressed, LOUD sound is totally cool these days.
So, there you go.
But louder isn't better, better recorded is better.
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