Advise on developing (by self) in analog circuit design field
I would do self projects, I tried to start a business selling hardware. Then I found out that there is little money in that and I hate writing software so I bailed out. In the process I hand built several PCB's. I also did the equivalent of about 5 senior projects, and took every class that had a design project lab. (I didn't sleep for two semesters.) I also joined some student design teams. I did this because I enjoy learning, not because I wanted an awesome job. I also got a masters degree. 

Because of this I landed a senior analog designer job, because I had the necessary experience and I had been designing hardware for a few years as a student.

The first thing is work hard and know stuff and do stuff. Get your hands dirty and get some hardware designs and implement them. Not every employer will look past your schooling to look and see what you actually know, but find the right employer. 

A graduate that hasn't touched any hardware has many lessons to learn.
School will only teach one how to create designs, but not how to implement them. You must have working knowledge and actually going through the design process and making mistakes and learning from them to become valuable to industry.