When I search "monstera" I will get 33 result sites (with 120 models per 1 site) - so it is 3960 models.
Probably most of the models on 1th pages are of the same quality like your model.
I don't know why your model is not exactly on the 1th page - probably there are too many candidates to "occupy" the 1th page.
This is the general problem of (over)saturated model categories.
I would maybe try to do more collections which can be higher priced.