I believe that certifications that don't have a practical aspect to them are totally worthless.
I work in appsec and recently completed OSWE. The coursework was ok, nothing groundbreaking, learned a cute trick here and there.
Would I recommend it? Yes, especially if the company pays for it.
Company that I work for allows people to spend weeks of their working time preparing for top CTF contests and that is valuable because it is something practical. Just don't waste your time memorizing answers to exam questions.
Application Security Engineer here.
For a developer I would recommend the OSWE certification which takes a more code-centric approach and resources such as https://portswigger.net/web-security and The Art of Software Security Assessment book. You can also leverage your DevOps experience for learning about server, app and cloud misconfigurations and their impact on security.
The demand for network security is not as high as for appsec people and I personally don't see network security as very rewarding (intellectually and financially).
For the Pentesting route I recommend trying some HackTheBox and watching Ippsec's channel (https://www.youtube.com/channel/UCa6eh7gCkpPo5XXUDfygQQA).
OSCP is fine, but it is a beginner certification and definitely not enough for getting a Pentest job.
cryptopals was the reason I got into security, everything just pales in comparison.