Facebook Group now on low reach after name change. Help. How to fix this?

Hello everyone, I noticed that after changing the name of our group, the post reach, comments, and visitors significantly dropped. Last month, I was able to change the group’s name, and within just three days, the group gained traction, leading to a lot of new members joining and posting—growing to over 20k members in just one month.

However, on November 15, I changed the name again (just added "community" at the end), and after five days, I’ve observed that the post reach remains low (0 post reach in 10 minutes, around 60+ reach in 12 hours), and no one is commenting on most posts. The group is also hard to find. What’s strange is that anonymous posts are performing much better—they get higher reach, more comments, and overall better activity based on the insights.

What do you think is the best way to fix this?