For now the market is on the bear side right now, but your still starting i think joining in a community has no bad timing, this is a great place to learn and to exchange knowledge and opinion
So what should i do to earn ? do i need a job in here or buy a lot of cryptocurrency
To earn you can trade. If you want to trade during bear market then you need to keep an eye on short term pumps of alt coins or short your bet.
In stocks and Crypto markets there is a option to earn irrespective of the direction of the market i.e., when the market is bullish you can Long your bet or buy and when you think market is bearish then you can short your bet. There is option trading too.
The market/platforms have provided traders a lot many variety to earn. One can earn if his/her market reading skills are good. So, read and learn to read the market.