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You can earn $1000, $10000 and unlimited number of money with trading but you have to calculate your chances here. How big is your capital? What's the chance of you earning $1000 profit per month? Income from trading is not consistent and there is a high chance of trader losing all of their money instead of regularly making the profit.
With large capital, you don't need to calculate opportunities like in future trading to get a profit of $1k in a month. If you have $10k as main capital, then you might just need to be a little patient to wait for price movements so you can make $1k. Strategy and capital are very decisive, even if you only focus on spot instead of futures.
I wouldn't say traders can consistently make profits every month in the same amount with a certain amount of capital, but you won't lose all your money just from trading, especially if you can avoid trading futures. Just try trading on the btcusdt pair on spot, this is also a good option to make a profit, especially when you have capital and understand the strategy.
It's hard to predict whether you need to be a little patient or very patient. What, if you bought Bitcoin a few days ago for 97K and the price keeps falling for a few months? What if 4 month passes and Bitcoin's price ranges between 70-80K? This is definitely a virtual case but that's very possible in trading. What are you going to do for 4 months? Maybe you haven't got enough profit to cover 4 month expanses and/or what about if something unexpected happens? Trading is a dangerous game.
You shouldn't leave your job easily, especially if worked for a long time in certain company and that's why you get a better position because if you are easily replaceable, it will be harder for you to get a good job easily. If you a senior software developer or something like that, then yes, you have the priority to leave your job anytime because you are constantly on demand.