Which holds the key to a successful business?

I'm quite confused about using modal verbs. Please give me some feedback on my essay below.

My answer:

People have various views about which factors hold the key to the success of a business. Although in a business's development marketing and promotion play a significant role, I believe other factors are also of great importance.

On the one hand, a firm can greatly benefit from marketing and promotional campaigns. Marketing is a bridge between the business and its customers, taking a new product to market. By carrying out advertising campaigns, the company can provide clients with many discounts and a wide range of product information, including prices, manufacturers, and specifications. Therefore, customers is likely to be convinced and willing to buy more products, which would increase the revenue. In addition, marketing can help a business enhance its public image. Apart from the quality and features of products, firms tend to attract customers through their social obligations, such as supporting local charities or environmental projects.

On the other hand, I believe it is work environment that have a profound influence on the performance of employees and a corporate as a whole. A work environment with strong interpersonal communication can probably increase the productivity among workers. For example, if employees from almost all tiers are approachable and attentive, they are more likely to work well with each other and come up with creative and diverse opinions . This will foster the growth of the company. Besides, happiness and satisfaction when working in collaborative and positive atmostphere would retain employees in the long run and motivate them to work harder, which would lead to a robust and strong company.

In conclusion, in my opinion it is essential that other than business strategies, such as marketing and promotion, firms take work environment into consideration to gain both short-term and long-term success.