I don't think STEEM has gotten anywhere near its peak. The July 4th Event brought in people who already used Cryptocurrency, because that is mainly who heard about it then. Then Reuters, CNBC, The Guardian, etc, brought it to the Public's attention, and during this same time all the CrpytoCurrency people and their friends and the Media and their friends and the people getting information from the Media and their friends, were all learning about STEEM at the same time. So it went up to $5 very quickly from around .70-.80cents, then stabilized around $3-$4.
There are still peaks to come. What about when Steemit gets its 1st Famous Band, or Famous Actor to join. Or when it gets its First Billionaire investor. Or when a Country starts making Laws specifically about STEEM, that will drive all kinds of News and Attention. That is the same way Bitcoin got to $1,000. When Countries would announce Bitcoin rules, or Ban Bitcoin, it drove huge amounts of people to start using it, because they didn't even know what it was until they heard that some country banned it.