We don’t know what you are trying to “step up”? What part of your current audio does not meet your expectations? Typically, the selection of the microphone, and its placement are major factors. But you seem to want to stick with a small consumer level microphone mounted on your camera (?)
You say you want to go to “double-system” where the audio is recorded on separate gear (vs. recording in the camera). While it is true that DSLRs are almost universally not terribly good at recording audio, we don’t know if that is the limiting factor in your desire to “step up” your audio quality?
Note that most (or all?) of the “nature” video you see has audio that was NOT recorded at the same time as the video. And in many cases, the audio track was “created” in the studio and no live sound was even used. You might find it interesting to watch this video documentary about sound for nature documentaries:
https://youtu.be/Li6TSwybqjU
It is almost always the case that the optimum time/location for shooting the video is NOT the same as the best time/place for recording the audio track.
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Recording audio without metering and monitoring is exactly like framing and focusing without looking at the viewfinder.
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