: How to flatten frequencies like that What I just didn’t work out. No multiband compressor will work that way. It's only a clipper or distortion that can do that.

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Firstly, use your primary weapon against frequency problems- the EQ! If any frequencies are consistently too loud, your eq can tame them.
For more erratic problems, there are more specialized solutions. ReaFIR, available for free with the ReaPlugs Plugin bundle, is designed to do exactly this, although you will find that the result is riddled with sonic artefacts and nearly unusable. There are more expensive options, such as the Soothe plugin and Waves' L3-16, which is a 16 band multiband limiter. I have no experience with either.
Beware of using your production tools to solve performance or recording issues. If you've synthesized a sound with a nasty resonance, you could probably fix with your synthesis controls. If you've recorded a sound with a nasty resonance, you could probably fix it by moving somewhere else, or using a different microphone, or working on getting a better instrument tone.
Some instruments just have resonances, that's part of their sound. Flattening them out isn't necessarily fixing anything.
For example, you can clearly see the lead vocal on this professionally recorded, mixed, and mastered rock track.