Just do some signature campaigns, its easy and also a good thing to do because its easy and also a nice way to make some good money with it.
Of course its depending on what you want to do but I think its one of the best methods to get some nice free non risky bitcoins.
signature campaign alone is not enough to increase our bitcons but we also need some extra work to earn bigger and so we have to invest our earnings from sig in to trading to increase them more,