Amazon niche site making $300/m - how can I triple that?

Hello there, this is my first post as I just joined the forum. After years of lurking I've finally decided that I have waaay too much to learn from you guys so I should participate actively. Here I am!

Exactly 12 months ago I started a niche site with product reviews and I'm monetizing it through Amazon's affiliate program.

It's been making about $300 a month, but it does fluctuate a lot. July was my best month ever at $872, but october started very slow - we're 10 days in and I'm still at $66.

My question to you legends here is:
HOW CAN I TRIPLE MY EARNINGS?

My goal for this site is $1000/m, but I don't know what else to do to get to that number.

I'll throw some numbers from the past 4 months so you guys can analyze better:

JUNE
4,300 Users
987 link clicks
198 items shipped
22,09% conversion on Amazon
$225.09 earnings

JULY
11,471 Users
4,246 link clicks
707 items shipped
17,33% conversion on Amazon
$872.38 earnings

AUGUST
5,462 Users
2,011 link clicks
277 items shipped
13,92% conversion on Amazon
$330.96 earnings

SEPTEMBER
4,358 Users
1,960 link clicks
247 items shipped
13,27% conversion on Amazon
$318.84 earnings

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Thanks, you guys rock!

PS: I asked this same question to some experts, I'll post their answers here as updates:

UPDATE #1: Spencer Hawks - NichePursuits.com:

"Come out with your own digital or physical product and you will likely triple your monthly earnings."

UPDATE #2: Lewis Ogden - CloudIncome.com
"1) Check out the KWGR (Keyword Golden Ratio) by my buddy Doug Cunnington - it's a content method that we both use to drive more traffic by targeting low competiton keywords.

2) Look at your top traffic pages (90/20 analysis) and work on the CRO for those. E.g in your tables I see a 'Price' column...instead I'd use "Our Rating" and then have a button or link that says "Check Price"

3) Try out CrazyEgg and get a heatmap on your top pages - it will help massively to see where/what they click on.

4) Find your top 3-5 competitors and use SEMRush to see what they rank for...use Ahrefs to ascertain keyword difficulty (using the KD score).

5) Build more links. If you have the funds, I'd do a 'sponsored link' campaign, reaching out to other health type sites and paying $50 for a link in an existing article...this works very well.

That's what I have off the top of my head and that is more than enough to 10x what you have right now buddy."