If you just stay active, you'll reach hero rank sooner or later. The less you keep particular goal in mind, the easier it'll be.
The hardest part isn't to get merits, but it's to gain activity.
I never post for quota or volume, but I do post a lot (often between 30 and 50 posts a week since I've been really active). But it's hard to get activity up, 14 by 14 is slow... (not complaining, I like the fact that to rank up takes some time)
That depends on user, you seem good poster so you have achieved merit early than activity points, you should be leggy by now just looking at merits.
For most other users, it's other way around, easy activity (in comparison), hard to earn merits.