Adding for context (and if I read it correctly): Moneti was getting DMs from people inquiring about new characters or blooms, to which she addressed in the tweet I reposted, so I suppose it's not about lack of support. Case in point, Red Spider Lily and Kerria have been consistently strong contenders for new versions in all the past polls.
*Won 6★ Shrine Maiden version
Year Red Spider Lily Kerria 2016 1st*
7th 2017 6th 11th 2018 4th overall
1st in 6★ rarity category8th overall
1st** in Bergamot Valley category2019 ? ?
**By virtue of Red Spider Lily (37,089,418) already winning the 6★ ranking, Bergamot Valley second-placer Kerria (23,975,032) became #1.
Looking at her timeline, she appears to be in high demand, that she's being commissioned frequently (as stated in her tweet I shared) for several media, VNs and doujin included, after all. Thus, it won't be surprising if she has become burdened so much that she had to drop her commitment to FKG for one.