Mathematica Finding a function to best fit a curve

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To fit the specified curve, which exhibits a slow decline followed by a rapid rise, a suitable approach is to consider functions resembling an upside-down resonance curve. This type of curve can often be modeled using functions related to low-pass filters. Exploring a logarithmic scale for the ordinate may also enhance the fitting process, potentially providing a clearer representation of the curve's behavior. Resources such as instructional videos on low-pass filter resonance curves can offer additional insights into suitable fitting techniques.
kelly0303
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Hello! I want to fit a function to the curve I attached (the first image shows the full curve, while the second one is a zoom-in in the final region). Please ignore the vertical lines, what I care about is the main, central curve. It basically goes down slowly and then it has a fast rise. What is the best function that I can try to use to fit this kind of curve? Thank you!
 

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What is it ?

Looks like an upside down resonance curve like

1575024971485.png
(from here)

Also: googling 'low-pass filter resonance curve' yields this nice video.

Perhaps you can try a log scale for the ordinate ?
 

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