There's a lot of way to earn bitcoin, sample you can earn bitcoin thru faucets, join to signature campaign, invest to the other altcoins who had potential to increase their amount and trading system and etc. Just be open minded to the opportunity open to you.
Yeah your right dude, you also earn bitcoin in gambling, but if you try the gambling make sure that you are ready for the consequence of this. Also, you can use lending of bitcoin but before you lend your bitcoin make sure for the collateral and be sure that you lend to the trusted people to less the risk you want to take.
although gambling is the easiest way of earning bitcoin, because in gambling you do not require any knowledge or experience, but you just need your luck, because in gambling we mostly depend on our luck and no one can be so much luck for every time. therefore I think trading will be the second best option to earn bitcoin, but in trading you need to have good experience in trading. you must also have good knowledge about trading.