React is still a hot commodity/demanded skillset, so position discoverability is probably simpler.
Have you checked job boards like Indeed? Are there any large companies you are aware of with Elm as part of their stack you can make connections with?
Did you try rescript + react? Still functional but... BTW might be looking for rescript+react devs on my side => rescript _at_ laplace.kr
Where are you looking? (UK/EU/US/etc)
Isn’t the obvious explanation that companies don’t use it as much? (And it’s not remotely close either.)