I think the whole premise (one "growth hack" per day) isn't right. I would call this more like "one UI touch-up per day." I don't mean that in a condescending way.
If you want to make a bigger impact you have to dig deeper. Look at your analytics and conversion funnels for ideas.
For example:
Is there a bottleneck for many visitors on their path from First Visit to Signup? Do visitors from a certain source convert or stick around longer than others? Is there a page within your Docs section that a significant number of visitors view before eventually signing up?
Now make some educated guesses to explain the data. For example:
If 13% of the Trial User segment viewed the demo apps prior to signing up, maybe the demo played a significant role in convincing them to sign up. (BTW, you can even segment this group out in Analytics as Demo Viewers and compare their conversion rates vs those who did not view the demo.)
And now for the test:
A/B test adding a link directly to the demo somewhere prominent on the homepage (maybe even replacing the subscription link under the CTA).
* * *
Lots of blogs make it seem as though you can "growth hack" by merely changing a button color or adding a modal popup somewhere. Easy things like that only work when you're starting from the bottom. Once your site is half-way decent, it takes more ingenuity than that to make a meaningful impact.
EDIT: From looking at the other comments here I'm getting the impression that you don't have a whole lot of traffic. In that case you probably don't have enough Analytics data to look as deep as my examples. Still, assuming your Analytics is setup properly, you should be looking at it for opportunities.
If you want to make a bigger impact you have to dig deeper. Look at your analytics and conversion funnels for ideas.
For example:
Is there a bottleneck for many visitors on their path from First Visit to Signup? Do visitors from a certain source convert or stick around longer than others? Is there a page within your Docs section that a significant number of visitors view before eventually signing up?
Now make some educated guesses to explain the data. For example:
If 13% of the Trial User segment viewed the demo apps prior to signing up, maybe the demo played a significant role in convincing them to sign up. (BTW, you can even segment this group out in Analytics as Demo Viewers and compare their conversion rates vs those who did not view the demo.)
And now for the test:
A/B test adding a link directly to the demo somewhere prominent on the homepage (maybe even replacing the subscription link under the CTA).
* * *
Lots of blogs make it seem as though you can "growth hack" by merely changing a button color or adding a modal popup somewhere. Easy things like that only work when you're starting from the bottom. Once your site is half-way decent, it takes more ingenuity than that to make a meaningful impact.
EDIT: From looking at the other comments here I'm getting the impression that you don't have a whole lot of traffic. In that case you probably don't have enough Analytics data to look as deep as my examples. Still, assuming your Analytics is setup properly, you should be looking at it for opportunities.