Participate in the Bounty campaigns, Is it really a sufficient investment to provide all your daily needs?
No, it's not. You may even join a scam bounty so how's going to be your daily life if it turns out a scam?
Sometimes I think of abandoning my formal work and joining the virtual world to achieve my destiny.
Don't do that, stay on your day job and if you ever want to get into bounties. Use your spare time. But if you want to create a virtual career, there's ample of opportunities out there but it's not bounties but becoming a virtual assistant or freelancer online.
Do you have a clue about investing effort that needs to promote alternative currencies?
I've known a CEO that keeps on promoting his altcoin but I don't find it encouraging and interesting. What you really mean by this question?
Can I make $ 100,000 a year?
Out of bounties? no it's impossible. If you want to make this much per year, you need to have many avenue of income and don't just depend on one income stream.