Upskill for my new post

Hey guys, I recently got promoted to an SDE2. Although I got a decent hike, some of my colleagues who worked equally hard got better hikes(say i got x% then they got 1.5 times of that). I am a java beckend developer (spring,aws,gcp, mysql,redis etc). I want to upskill myself and be a better developer. And to make a future job switch easier. It would be really helpfull if you guys could share some good articles/books to upskill and a roadmap to follow to switch the job.