My Youtube video's audio is quieter than other videos

I uploaded a video to youtube and the sound is a lot quieter than other videos on youtube, but in Davinci Resolve the sound is mostly in the red in the mixer. Does that mean that everyone else on youtube uploads videos well in the red section of the mixer? Should I fix this?

Please learn about audio compressors, that's what one uses to give your audio more 'punch'. Fairlight can do it.
(This is not the same as data compression for audio)

There seem to be a lot of YouTubers out there that think they need to crank the volume up to the -3dB to 0dB range, but that's considerably too loud. If you compare the volume of your video to professional work such as that you'd find on Netflix, Disney, etc. you'll get a better idea of where you stand.

Instead of telling you to rtfm, I'll give you a real answer and tell you what I've learned.
I'm not an audio specialist, at all, but here what I know.

Youtube set the loudness to -14 LUFS, it means that if a video has an audio track that is louder than that, youtube will reduce the volume of the whole video by "X" db (it doesn't care if there a just some parts of the audio that makes the whole track go above the limit, it just brings all down).

It's different for other platforms, you can find a list online. You can export different version for each, you can export an unique file at -23 LUFS (to be safe) but it can sound too quiet in comparison of other videos on some platform (like youtube), or you don't care and let them reduce the volume (or not touch it if it's in the range)

You can see it if you activate the "stats for nerds" on the youtube player (right click to access it).
On the screenshot you can see the difference. The "original" volume was reduced (when it doesn't, it shows 100% / 100%).

I personally use this website (it analyze the audio locally on your machine) : https://www.loudnesspenalty.com/ I export just an audio file and drop it there to see where I'm at.

You can set your "Target loundness level" in the settings (see screenshot) so it's easier to analyse your audio meters.

You can also analyze an audio clip from Fairlight by right clicking on it then "Analyze audio level" (see screenshot). You'll just get the levels for this particular clip. I guess you can add every clips in a compound clip and analyze your whole timeline that way (never tried it).

Like I said, I'm not a specialist but I know that if I'm at -14 or below that, it works, if I'm over, youtube will reduce the volume of the whole track by X db. It works for me

Oh, and you can activate the "Loudness history" too, click on the automation icon, the you'll see a new track appearing, activate "Loudness history" selection Integrated (or everything) and you'll see how the audio behave over the course of your clip. - But I'm not familiar at all with this so I can't help more

Thanks for elaborating on the matter Maxwellx. My project setting for target for target loudness level is set to -23. I will try with your suggested setting of -14.

Thanks for elaborating on the matter Maxwellx. My project setting for target for target loudness level is set to -23. I will try with your suggested setting of -14.

Yes -23 is by default in Resolve.

It doesn't really matter what level you set for the target because it doesn't impact what you do, it's just more practical to see in the meters and be in the right range without having to calculate anything in your head

Good luck