Personally for me, I always second guess the architecture/approach of my personal projects. That's usually my biggest struggle! hahaha, weird as it may sound. Not the easiest 'internal' issue to overcome, because I don't know what I don't know. So I figured that just going deep into a particular domain will be helpful.
When it comes to deployment, I personally have quite a deep experience working with Kubernetes and docker at work. Not the easiest to learn, but definitely rewarding when you can get it right, I'm sure you have similar experiences as well! Would love to hear from you what are your personal projects as well (:
Here's just my attempt to learn and address my 'don't know what I don't know' issue:
https://blog.phuaxueyong.com/post/2020-05-03-3-more-cloud-de...