During decline, demand for a good begins to taper off, and the firm may opt to discontinue the manufacture of the product. This is so, if revenue for the product comes from efficiency savings in production, over actual sales of a good/service. However, if a product services a niche market, or is complementary to another product, it may continue the manufacture of the product, despite a low level of sales/revenue being accrued. 
The rise of social media platforms has increased the importance of social media marketing, including connecting with customers on social media by persuading them to follow your business, partnering with social media influencers through product placement or paid sponsorships, and paying for advertising on platforms like Facebook or Instagram. The types of advertising that you choose will depend on your budget, type of business, and the preferences of your ideal customers. HOW MUCH WILL I EARN AS A DIGITAL MARKETER? | Q&A | All about Marketing
Digital marketing is defined by the use of numerous digital tactics and channels to connect with customers where they spend much of their time: online. From the website itself to a business's online branding assets -- digital advertising, email marketing, online brochures, and beyond -- there's a spectrum of tactics that fall under the umbrella of "digital marketing." HOW TO BECOME A DIGITAL MARKETING CONSULTANT | My Path, Mistakes and Keys to Success
It is important for a firm to reach out to consumers and create a two-way communication model, as digital marketing allows consumers to give back feed back to the firm on a community based site or straight directly to the firm via email. Firms should seek this long term communication relationship by using multiple forms of channels and using promotional strategies related to their target consumer as well as word-of mouth marketing.
Positioning concerns how to position a product in the minds of consumers and inform what attributes differentiate it from the competitor's products. A firm often performs this by producing a perceptual map, which denotes similar products produced in the same industry according to how consumers perceive their price and quality. From a product's placing on the map, a firm would tailor its marketing communications to meld with the product's perception among consumers and its position among competitors' offering. 
Pixels track everyone who comes to your site, and you can build custom audiences around them. For example, if you post content about how to learn to drive a semi-truck, and you track visitors with pixels, you can then market truck driving certification to people who have already shown an interest in that already because they visited that specific page. And your conversions will skyrocket.
Marketing strategy and marketing mix are related elements of a comprehensive marketing plan. While marketing strategy is aligned with setting the direction of a company or product/service line, the marketing mix is majorly tactical in nature and is employed to carry out the overall marketing strategy. The 4P's of the marketing mix (Price, Product, Place and Promotion) represent the tools that marketers can leverage while defining their marketing strategy to create a marketing plan.
The role of a social media manager is easy to infer from the title, but which social networks they manage for the company depends on the industry. Above all, social media managers establish a posting schedule for the company's written and visual content. This employee might also work with the content marketing specialist to develop a strategy for which content to post on which social network.
This refers to how the product gets to the customer; the distribution channels and intermediaries such as wholesalers and retailers who enable customers to access products or services in a convenient manner. This third P has also sometimes been called Place or Placement, referring to the channel by which a product or service is sold (e.g. online vs. retail), which geographic region or industry, to which segment (young adults, families, business people), etc. also referring to how the environment in which the product is sold in can affect sales.  4 Principles of Marketing Strategy | Brian Tracy