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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.
But just make it sure that you arent that making use of the money on which that you cant be able afford to lose. Lets say that you do have that $10k capital and trying out to make some $1000 in a month then its possible but of course you will be needing up to have that good entries on making some buy and sells in between movements towards the price of Bitcoin. 10% gain in a month lets say that you are targeting on Bitcoins price movement is really just that easy. The hard stuff on here is on how you would be able to predict on when Bitcoins price will be making up corrections on where you will be making that kind of entry on which at the moment that it will recover then pretty sure that you would be making some profits. Quitting up your work will be that a risky move to make but if you do find out that you are already sustainable then it wont be that bad to make up such decision. It is really giving out that good feeling that you dont have a boss that will be ordering you around or having the hassle on daily commute but i do agree into the points above on which if you are that wanting on having that couple or tons of multiple income source then you wont be considering out this kind of act but rather trying to pile up even more. For trading in futures then this is really that more riskier, yes the potential gains will really be that higher once you do able to get in on the right trend or simply on the good entry but with leverage trading which the risk is more higher and this is somewhat understandable and need of tons of considerations before you do make use this kind of path.