But it's just my feeling, maybe because they think that I'm Legendary.
What is happening to you is normal and also happened to me and many others. Simply when you are ranking up, many forum mates tend to give you more merits to help you reach the ranks. Once you have the necessary merits to reach legendary, that extra push stops.
Yep, and I probably didn't convey that sentiment in my previous post, but it's quite true. Your posts might still be of the same quality, but many members with merits to give away (including me, which I did say) do look at someone's merit count when they're deciding whether they're going to give someone merits.
I was going to post exactly this that you already commented, I thought no one was going to comment on this point
But it is a fact, I think most users go through this same phase when they reach the legendary level.
I can say that I also had/have the same behavior, as I didn't have many merits to give, I often didn't give merits to legendaries in very good posts, just because the user is already a legendary and I had only 1 or 2 merits to give.
Thankfully we have merit sources that fill this gap and can give more merits to legendaries and balance things out a bit.
Some sections of the forum are also extremely hard to earn merits no matter the quality of the content too.
Now it is my turn to face this legendary level plateau.
From 900 merits up to 1000 were my fastest merits that I have earned, I think this also influences a lot the perception that when you reach 1000, the merits diminish.
With time you should get back to normal and get the merits again, but with another frequency that will depend on the boards you post / merit sources / quality of content.
Edit: forgot to mention, I consider this phase as a good chance to further improve the posts and try to add more value to the forum.