which prog lang is a hot trend with respect to demands in org + good for the long term. Have worked on Java Springboot Angular - bored rn!

Need a switch up in stack or I want to learn something new, a refresher, past 8 yrs on Java angular - grown bored and since exp is in this, most jobs I am qualified in are this tech stack mostly legacy banking kind of projects. Can you suggest me tech stack I can learn to boost my chances + get into a different space in terms work satisfaction. Eg Golang, Python, Flutter etc are what I heard but not sure.But according to you what is good programming lang to deep dive, I am ready to learn from scratch! Also do you think instead of frontend backend, devops/cloud is the route. The thing is I am bored, I need and want to dive into something new and work on it to gain real work experience outside my side projects. Your advice is highly appreciated.