They could start by ceasing their union busting efforts.
Last year they posted a job looking for a senior intelligence analyst to gather info on "sensitive topics that are highly confidential, including labor organizing threats against the company." Later that day they claimed they had made a mistake in describing the job.[1]
There is no single answer on what pay and benefits should be, or how well they should treat their workers. That's the whole point of unions: they provide collective bargaining where employees can decide how much their local area can reasonably support.
That's why organized labor is a threat to them. Their business model depends on squeezing wages and benefits, which is exactly what they did when they bought Whole Foods. They removed medical benefits for part time employees[2], and have recently cut paid breaks from 15 to 10 minutes, which now includes the time it takes to walk to and from the break room.[3]
[1] https://www.cnbc.com/2020/09/01/amazon-seeks-intelligence-an...
[2] https://www.usatoday.com/story/money/2019/09/14/amazon-whole...
[3] https://www.cbsnews.com/news/whole-foods-cuts-some-workers-p...