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Some fundamentals of a blockchain developer have been listed in this article: https://pantograph.io/how-to-become-a-blockchain-developer-a-simple-guide/

Highlights:

- Understand Blockchain Fundamentals
- Learn Blockchain Architecture
- Understand Different Programming Languages
- Learn Smart Contract Development
- Join a Blockchain Company

For you, what are the key requirements to become a true Blockchain Developer?

Many other relevant articles can describe the process in simple words.[1] [2] [3] [4] [5]
The most important part is that you need to have some relevant skills to start a path in blockchain developement. Otherwise, it would be harder to start from scratch. Those skills can be resumed in five big branches:

• Cryptography.
  
• Smart Contracts.
  
• Data Structures.
  
• Blockchain Architecture.
  
• Web Development.

Many universities arround the world started offering blockchain courses, which make it easier for people to start a blockchain carreer a it's not that to practise what you may learn without joining a group. Few people succeeded to build blockchain apps by solo learning.

[1] https://medium.com/@ledumjg/how-to-become-a-blockchain-developer-dd0d4b83cc37
[2] https://blockgeeks.com/guides/blockchain-developer/
[3] https://www.entrepreneur.com/article/314921
[4] https://www.simplilearn.com/tutorials/blockchain-tutorial/how-to-become-a-blockchain-developer
[5] https://www.upgrad.com/blog/skills-needed-to-become-blockchain-developer/

All that's been mentioned in the OP is quite attractive and looks simple when viewed. The same in reality isn't an easy thing to be done. I have a friend who is a Blockchain developer, I introduced him to cryptocurrency. He is from information technology domain. Now he masters me, and he tries to make me understand. I find it difficult to stand against his knowledge. From his experience on other domains of information technology different software he find it simple, while the same is unreachable for me. In simple everyone can't be Blockchain developer as some people think.

In case you're fascinated by the specialized angles of how to make a fin-tech application on best of the Blockchain at that point you should definitely learn the ins and outs of crypto-economics. Most designers are more often than not well-versed within the “crypto” portion of the condition but their information of the “economics” portion is greatly missing.

I also think that strong technical background prior to learning stuff about Blockchain is a must, or otherwise it would take a long time to learn even the basics. To be fair, the op does mention understanding various programming languages, and this kind of presupposes that a person is specializing in blockchain development after getting experience in programming. I don't think I'll ever become good at this stuff because I don't spend or plan to spend enough time on this. However, I think that potentially pretty much any average person can pull oneself together and become a professional if one spends enough time and puts enough effort into this.

You will get to learn web design, development and programming of apps, all of which will help you develop better Dapps. Web development is important because most organizations need blockchain developers (https://www.technoloader.com/) to create apps that can be used by people with little or no knowledge of blockchain.

There are many altcoins that have a very small or even non development community. If you have no experience and want to learn you can try there. If you really want to invest your time they will help you to learn how to solve the problems. Still at the beginning you will not be paid much or even nothing at all, if this is your goal.