The HTTPS ranking signal that was announced by Google some weeks ago has not been very significant to many webmasters. Google’s Gary Illyes commented on that on Twitter:
@MattSouthern more like a dealbreaker. All other signals being more or less equal, it gives a page the edge needed to top the other result— Gary Illyes (@methode) 21. Juli 2015
If two pages are equally good, the HTTPS pages will get the better ranking. That means that there are many other (and more important) things that you can improve before switching your site to HTTPs.
Other things are more important
HTTPS has only a minor influence on the rankings of your website. Other things are much more important.
The Top 10 Optimizer in SEOprofiler analyzes all important elements of your web pages and it tells you how to optimize them so that your web pages get better rankings. Optimizing these elements will have a much bigger impact than using HTTPS If you haven’t done it yet, try the Top 10 Optimizer now: