This prompted me to look up whether Esperanto is growing or declining. These numbers seem optimistic:

UEA members over the last 100 years (Universal Esperanto Association)

Number of participants in popular Esperanto meetings in Germany:

Also according to Duolingo there are 1.2million people learning Esperanto, which is up from 1million in 2018.

Given these things the vibe I get is that it is a growing language worthy of some optimism.