Most of the SEO suggestions (great quality content, long form content, engagement rate/time on the page, authority inbound links ) apply to content oriented site. But what should you do if you are an aggregator or a resource directory?  You aim is to send the user faster to other site they are looking for or provide ranking about the resources. In fact at a very basic level you are competing for search engine traffic because they are doing same things. You may have done a hand crafted, human created resource that is better than what algorithms are showing.  And your site  likely to have lot more outgoing links than content. You know you are better (or getting better) since repeat visitors keep coming back. So in these days of Search engines, what a resource directory or aggregator site do to rank? Because even directories need first time visitors till they start coming back again.