Why I can't set "Regular" below my username?

Before, I was able to set the “Regular” title below my username. Now, this title is hidden and I can’t restore it!

It looks like you’re no longer a forum Regular which is why you can’t set it as your title anymore.

Yeah… Trust Level 3, or “Regular” is a lot of work to get/maintain. From the Discourse blog:

Furthermore, unlike other trust levels, you can lose trust level 3 status . If you dip below these requirements in the last 100 days, you will be demoted back to Member. However, in order to avoid constant promotion/demotion situations, there is a 2-week grace period immediately after gaining Trust Level 3 during which you will not be demoted.

Source: https://blog.discourse.org/2018/06/understanding-discourse-trust-levels/