how to find good amazon affiliate niche?

please help me find a easy niche for amazon affiliate

What ideas have you come up with so far?

Use a keyword tool, find low competition keywords that are related to high priced items on Amazon. Once you've did this read up on how to rank with the keywords you have chose. Then build your site.
WARNING - Its not that straight forward but thats the general flow.
Use the search function at the top of the page, hundreds of amazing threads about how to start an Amazon affiliate website.

Depending on what you mean by easy. Easy to rank on SE results, easy to sell on social media, easy to compete on adwords/fb ads etc...

Micro-niches are always converting the best for me, but it depends on the type of traffic you plan to send to products.

It's easy, just buy any pbn service.
And check all the sites on it
You will get enough ideas...

PS: I am kidding.

PPS: Or, am I ?