There is no easiest way to earn merit aside from making yourself a high quality person through your post. How would you do that? Just be active on reading in every section, avoid first yourself of creating post if not necessary in order to keep you from making spam posting. This task is very easy and it will only hard if you want to join in the signature campaign, but remember that ambition will not help you for sure to receive merit. Because you will be tempted to create posts no matter it is constructive or not just to have the exact number of activity to become a Jr member and can join in the campaign.