There's many way of earning bitcoin that have a lower risk than your choices in poll, first steps by joining signature/bounty campaign is the best way that you don't need to invest or putting money all you have to do is giving time to participate in order to have reward weekly.
Trading is good if you know how handle it especially by knowing coins that have profitable, lower risk than trading is investing in a long run at this point you may hold either a months or a year. Very risky investing in ICO's project even though they have a good platform or even roadmap and whitepaper if they are going to quiet and abandon their project there's nothing would you do.