Do not make posts with the sole aim of agreeing or commending a previous post, with contents like: 'I agree' or 'Nice one'. That is the reason merits were implemented.
Spamming the forum is the reason why theymos implemented the merit system to reduce shitpost and spam in the forum which it really works and also prevent shitposter/spammers from ranking up their account just to spam, shitpost and doing bounty campaigns.