You'll want to think about what kind of promotion you can run for the end of summer (winter in southern hemisphere).
It's still several weeks away but if you start thinking now, you should have a few good ideas to pick from in July.
Come up with a promotion idea and then create marketing assets you can reuse. Assets like emails, social media messages, seasonal graphic templates, etc.
This season comes back every year so it makes sense to recognize the change and have a kit ready to make your marketing easier.
You can use the Cohort Report in Repeat Customer Insights to see how customers from those months in last year performed (e.g. how many one-time buyers vs repeat, total lifetime revenue, etc). That can give you some targets to aim for.
Get a complete view of your customer behavior
The cohort analysis in Repeat Customer Insights will automatically build cohorts for all of your customers. It has the ability to go back through your entire store history so you can get a complete view of your customer behavior.