Loud Background "filler" noise

Hello,

Since ever I have started with audio editing, I have been unable to deal with the constant humming “filler” noise that the mic seem to create when there is not a lot of information. Can an effect in Audacity fix this issue ? Or am I setting the recording volume too loud ? I turn up the volume (in the forest) so you can hear something, but I am better off setting a regular volume when recording and increasing the gain in editing ?

PS: Turn up the volume to hear what I mean.