1. Your product seems useful, so useful in fact I bookmarked it.
2. However you hardly had any Google traffic to begin with - maybe Google traffic is not something you should optimize for - except for when people specifically search for your product
3. with which your landing page might not help.
Let me expand:
1. I tried a few searches on your site and it generally came back with good results. I like that the articles are short, to the point and didn't waste my time. Some commenters here recommend to make those articles longer for SEO - don't. Making users read long articles is the opposite of what your site promises.
2. Google traffic is way less important for useful websites than SEO people would make you believe. If your product is good, people will come - and come back. SEO can actually hurt the usefulness of your product, and thus its long-term growth. Never ever listen to SEO people who want you to make your product worse. I may be suffering from survivorship bias, but less than 10% of my site's traffic comes from search engines, and 99% of that search engine traffic was just people searching the name of my sites. I can't tell you whether any site could survive on this, but I can promise you that this "independence" comes with peace of mind (I don't care whether I show up on Google at all).
3. It took me a moment to figure your product out. "This website exists to make shopping less time consuming" did not help at all - there's hundreds of ways I can imagine one might make "shopping less time consuming" after all. My confusion ended when I read "Find above-average products selling for below-average prices". Maybe that should be at the very top with the search field directly below it - which can also contain text other than just "Search.". Check the mockup at the beginning of this post. You could place the "less time consuming" text somewhere else, I just was too lazy. Some things besides "less time consuming" that people might search are "best budget products", "best value for money", etc. - so you could make sure these show up on your landing page too. Except after the text that explains the site for the human visitor.