I think the reason you're stuck on the Member rank is clear with all the above contribution posts. What I can add by checking my merit dashboard is this:



You are amongst 2.889 members that, having enough Activity, lack Merit to rank-up. Of those, 2.473 in your exact situation (with less than 20% of the required Merit to reach the next rank), 298 have between 20% and 40% of the required Merit, 25 between 60% and 80% and only 11 are nearly there (less than 20% Merit to go).
Quite some pipeline to surpass …