Turn up the gain where though? I’m copying this from the internet, because it’s pretty good:
It is easy to look at a professionally-mastered waveform and see that it “fills” space nicely, with big, fat waveforms and full sound, then look at your own recordings and see thin, “weak” sounding audio. Keep in mind that recording engineers do not actually record at this loud, compressed level - this additional amplification is done after the recordings have been made, in an effort to present a finished product that sounds full, loud, and professional.
In actuality, the recordings are usually made at around the -24db to -12db level, nowhere near the 0db floor. This leaves plenty of headroom to mix and work in, without having to worry about pushing the mix to the point of clip. Once the mix sounds good, additional compression and gain are typically applied to the master channel, boosting everything to the desired level of volume. Of course, there is variance in the amount of amplification needed - you probably wouldn’t want to compress an audiobook track to the degree you would compress a track of electronic dance music.
Therefore, what you’ll want to do is verify the level of your recording. It is easy to get caught up in the numbers, but what is most important is that the recording sounds clean and detailed. Even if the recording is low, it can be amplified after-the-fact with your DAW software. Rather than turning up the gain on your interface right away, simply turn it up to a level where audio sounds clean, record, and boost from there. Cranking up the gain on the interface can amplify the noise floor, causing static and white-noise sounds that are obviously undesirable.