Nothing wrong with holding a bunch of bitcoin, helping out the community and teaching more and more about the positives of crypto Just more money to be made in the end. Although it's always safe to diversify!

I'd start investing in the smaller cryptos, but in order to get into them you might need a little bit of ETH for ERC20 tokens. A little bit of BTC is nice but with $100 you'll get crazy fees, so it'll be better to just earn.

I would try to be more vigilant and lean on the side of paranoia with such things, it's better safe than sorry in such situations. Very few websites can be trusted out there, especially if it's a large Ethereum wallet

In terms of importance: YOUTUBE, BitcoinTalk, Reddit, Telegram (for communicating with responses to all those interested in investing) and then possibly Twitter, Facebook and Instagram just to maintain a presence but those aren't fully needed

Isn't it technically already a worldwide currency? I mean it's expanding every month and before you know it, even if Bitcoin does fail let's say 10 years down the line (due to a replacement, which may or may not happen) at least the blockchain revolution it started will have swept the globe.