I think that buying and holding could possibly make us rich if we got in at the right time and bought enough. But trading can also make a little profit.
yeah at this time the only best way to become rich with bitcoin is to buy some coins and hold them a few months or at least till the end of the year.
We can make that thing faster by starting buying some altcoins with a cheap price and then sell it for a higher price but before we buy coins make sure that it's secured and trusted. In that way (trading altcoins) can make help us a lot on collecting bitcoin because we can grow our bitcoin amount up to 200% in just a couple of days or weeks depending on if it's trend or not.