Still worth building Amazon Affiliate Sites?

[blogpostseller]

[font=-apple-system, BlinkMacSystemFont, "Segoe UI", Oxygen, Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif]I'm new to affiliate marketing. Is it still profitable to build Amazon Affiliate sites considering the commission rate cut earlier last year?

Also, is SEO still the best approach? I read so much about Google algorithm updates that break sites overnight. You can be ranking 1st on a few keywords then you won't be profitable the next day. What would be the best approach to this?[/font]