I am wondering, what is the activity required to get one merit because I have an activity of 68 and been here for a long time but no merit. I would be glad to have 1 merit for being from past 2 years.
First, why it seems you are not too familiar with the Merit System despite of being here since 2018? And second, why are you expecting to get even a single merit if your posts are not improving at all, or it just so happen that you are not aware of it 
? Dude even if you become the oldest member here it will be all useless if you remain posting like a lame robot (no offense). Grind harder, engage with more serious discussions and try to express your thoughts more. That's the only time you might get merit from the others.