After spending of +4 years working professionally with Ruby on Rails I've grown aware of its limitations. I've spent a long time searching for its successor in my programmer's toolbelt. I've waded through numerous Javascript frameworks yet every one of them proved to disappoint me after taking it for a spin. I've finally arrived at Clojure at the beginning of 2019 and it has been really refreshing. I love how well designed the language is, how mature the community is and I am amazed by the quality of the ecosystem.
You can see my repo-graveyard made along that journey here: https://github.com/roterski/sonder-syncrate
My personal bet for the next killer-app in web development is: Clojure[0] + Fulcro[1] + Pathom [2] + Crux [3].
[0] Love Letter To Clojure - Gene Kim (Clojure/conj 2019) https://www.youtube.com/watch?v=5mbp3SEha38
[1] Fulcro links and resources: https://www.reddit.com/r/fulcro/comments/dtzhsm/fulcro_links...
[2] The Maximal Graph - Wilker Silva (Clojure/conj 2019) https://www.youtube.com/watch?v=IS3i3DTUnAI