BTC had quite bad performance in 2018, but now it raised sharply almost to $9K, so it is a very good result. hope in future it will only rise, without any red zones.

I don't think that it's a good idea to leave the permanent job for the unstable crypto position. Even the cryptoanalysts make mistake in their predictions because the crypto is very volatile. You can leave your job only if you have a good financial background.

I think long downs and sharp ups are normal for digital currencies. It means that crypto develops. So, I think it has a great future and will grow further.

When you want to buy any token, you wait for the period when it is in the deep. So now it is the best time to do it since BCH is very low now, comparing to its last year price. But how to know, when it's better to sell it? I found the answer in this article. It is a very good analysis of Bitcoin Cash price for the following five years. You can see there different opinions of the crypto experts and make your decision.

In my opinion, BCH will never replace BTC and become the first cryptocurrency. But it has all the chances to make the best performance in near future. Do you know, what the BCH price will be in several years? I found a good price forecast of Bitcoin Cash and I'm eager to invest in it now. 

Yes, the right action for the stellar devs now is to improve the coin's characteristics.

Everyone here suggests bounty and airdrop. But it'snot for earning BTC. You can get the altcoins only after the new project was listed on exchanges. It takes quite a long period of time. So you should choose another option.