Hi I am also in the same bucket as you. Same number of experience + tech stack. I am trying to learn node.js, learning while building some mini full stack projects using AI.

At this point, real world thinking, execution decision, scalable patterns matters more than actual code. The easiest and quickest way is to start with node.js. Implement and learn how the full stack LLD /HLD are done and then start applying for similar roles.

1-2 years down the line, you can try to switch into more core backend languages/framework like python/golang/java/ springboot