Improvement of the site on laravel (LaraClassifier )

Practical experience with Laravel is required, you will need cases.
In the answer, indicate the cost and terms.

The LaraClassifier engine needs to be improved https://codecanyon.net/item/laraclassified-geo-classified-ads-cms/16458425

Ideally, if you already have successful experience with this CMS and understand its architecture.
It is necessary to estimate the cost of improvements:

1. Changing the routing of categories and a separate ad:
/{country}
/{country}/{city}
/{country}/{city}/{category}
/{country}/{city}/{category}/{subcategory}
/{country}/{city}/{separate-declaration}

For example:

/{russia}
/{russia}/{tula}
/{russia}/{tula}/{auto}
/{russia}/{tula}/{auto}/{sedan}
/{russia}/{tula}/{land-rover-range-rover-44-at-2015-137-536-km-4200562646}

2. It is necessary to be able to specify several categories for one ad, so that the same ad is displayed in several selected categories/subcategories.
2.1. Selection of the main category as in the default option.
2.2. Selection of additional categories of the ad (the ad is displayed in the established categories) https://disk.yandex.ru/i/rx39olRmYXH-Ow

3. When setting up custom fields, https://disk.yandex.ru/i/njva82wgixF7PA need to be able to enable the display of the field in the listing on the https://disk.yandex.ru/i/-qHap54Man8EGQ website

4. Do not break the rest of the functionality!