Solved – Bell-curve shape regression

I am trying to fit some data that looks like a bell-curve: we reach a maximum at some value close to the mean, then the graph falls towards zero as we get further away from it. I am not the "owner" of the data so I cannot share it with you here, but I think the idea is clear with the "fake data" below

I would like to find a non-linear model that can fit that type of data, but my search did not give me much information. What are your suggestions?

The data looks something like this

If your goal is to just describe the pattern, you could try a GAMM i.e. generalized additive mixed model. Choose the residual distribution to reflect the zero bound and any other data properties you may be aware of.

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