Interesting work
According to INC.com, the aim should be to connect workers with tasks they find challenging, that they enjoy and in which they see a deeper meaning. Of course some tasks and jobs are boring and unpleasant by their very definition, but it should be the goal of the employer to try to offer each employee at least to some extent a job that will somehow stimulate them.
Advancement and system
People lose their motivation to work and cease to like their job if instead of advancement they see only stagnation. With just a small amount of effort, however, almost every job allows the implementation of a system or way the employee can somehow advance. This system can be completely arbitrary and in reality need not be connected to a genuine improvement of knowledge and skills of the given individual. But you should still try to come up with a system in which employees can at least partially advance somehow or improve their profile.
Elimination of routine tasks
Routine tasks are able to demotivate any employee. If overwhelmed with routine tasks on a daily basis, even the best employee can be doomed and discouraged within an otherwise interesting job. Consider automation. Try to eliminate routine tasks of employees, or distribute the work among employees so that no one person is doing all the mundane tasks themselves and their work will thus be more interesting.
Projects
People are generally more motivated to work if they are given a degree of freedom and can move independently within certain limits. Therefore, employees should not merely receive a list of individual tasks to do; instead, they should get more general project assignments on which they then work themselves. Not everybody is capable of independent work and, of course, the size of these projects should be adjusted based on the skills of individual employees. But nobody likes working in an environment where someone plans second by second exactly what they have to do.
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