Add a filter to the product limit

vendor_can_add_product.php

        /**
         * Allowed WooCommerce Post Types
         *
         * @return  bool
         * @since    1.2.0
         * @author   Andrea Grillo <andrea.grillo@yithemes.com>
         */
        public function vendor_can_add_products( $vendor, $post_type ){
            $enable_amount  = 'yes' == get_option( 'yith_wpv_enable_product_amount' ) ? true : false;
            if( $enable_amount && 'product' == $post_type ){
                $products_limit = get_option( 'yith_wpv_vendors_product_limit', 25 );
                $products_limit = apply_filters( 'yith_wcmv_products_limit', $products_limit, $vendor );
                $products_count = count( $vendor->get_products( array( 'post_status' => 'any' ) ) );
                return $post_type === 'product' && $vendor->is_valid() && $vendor->has_limited_access() && $products_limit > $products_count;
            }

            else {
                return true;
            }
        }