To get a better AppSec perspective, you can always do some more offensive/red team oriented training. PortSwigger (makers of Burp Suite) have their free security labs online, and other places like HackTheBox exist. Familiarize yourself with the OWASP WSTG and take a gander at the OWASP Top Ten + cheat sheets.
There's not going to really be a great "bootcamp", but if you wanted some credentials you could grab a SANS cert if your company is willing to fund it, or HTB has two levels of AppSec certs too. The makers of the OSCP also have the OSWE, but these are all very offsec focused training for pentesters.
In terms of more defensive certs, I think Amazon has some that involve DevSecOps, same with Azure and GitHub, so those might be good things to snag along the way.
