When someone gives well reply and gets impressed with their effort but you are out of merits or zero merits in account. What is the better solution in this situation? I've noted few replies from member on my old post that they must deserves to get merited.
It's too early for you to start thinking about merits or gifting same to deserving members who have responded to your post. Take it that you are not yet qualified to give merits yet because you do not have any merits on your own post. If you don't have merits to give, you can just acknowledge their contributions and move on. Any other member of the forum who finds the posts worthy of merits can send merits to those posts. Now you should focus on learning from those deserving posts, that's the privilege you should be enjoying.