How can I find envelop of FFT spectrum?

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Here is my FFT result. Whole spectrum Whole spectrum graph

enter image description here Zoom In graph

There are so many noisy points, and I want to get a simple envelop line of the result.

I have used the find_peaks function, but it was not working well. peaks2, _ = find_peaks(Xk1_shift, prominence= 10**5)

Could you give me some advise?

envelope spectrum fft python
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