I recommend you watch the following video by a former Goldman Sachs trader, where he exposes how the big professional money profits at the expense of the retail trader.
My interpretation of what he says is that you need to invest based on your interpretation of the future, on things you believe will profit for fundamental reasons. You can then do the initial trade based on timing the market. But make sure fundamentals are right first. You must then not alter a trade shorter term, because the system is designed for money to flow from retail traders who trade too much money too often to the big players who trade based on fundamentals and hedging, and who make money slowly. The moral is that you could cash in the surplus, but dont do this too often, eg invest and forget for 3 months, and then cash in $500 as you wish, but as soon as you do this, dont look at the graphs for another 3 months: devise your own rationale because any rationale which too many follow will fail.
Basically if you trade too often, you will steadily lose money because you are fighting with the noise of the graph, and thus lose on the costs eg broker commissions. You need to give it time, that way the underlying fundamentals break through the noise. ie the graph is fundamentals + noise. You cannot progress trading the noise, because just trading against noise all your money will gradually vanish on the spread, on brokerage fees, on taxes, etc, ie the stock market is a casino as regards noise, eg over 1 month its a casino. With a casino each time you place a bet, statistically you lose perhaps 3%. So the more money you bet the more money you lose SHORTER TERM. Its the difference between betting £38 on one match by Liverpool, versus putting £1 on each of their 38 matches over a season. Anything can happen in one match, but over a season they will do well.
if the noise takes the $10000 to $10500 its irrelevant because later it will go there again, but eventually the fundamentals will take it to $10700 etc.
As with a casino, even if each time you cash in from the $10500, you will gradually lose money, because a casino is designed for a thin margin to be statistically lost each time.
The fundamentals grow slowly and shorter term the noise is much bigger variance. But if you give it time, the fundamentals outdo the noise, and at that point when the noise and fundamentals align you will have eg $10700. Now you could misjudge and the fundamentals descend. But you need to allow time to determine this, and then to quit as you misjudged. Now if after a year of no trades, it still isnt progressing, at this point you could just quit when it does reach $10500 because you misjudged the fundamentals. An example of fundamentals is that petrol and diesel are on the way out for cars, nuclear is on the way out for electricity, and solar + wind are on the increase. But you need to research the timescales of each, and invest based on that expected timescale and eg in geographies at an earlier point in the transformation.
But if you just make decisions on graphs, you will gradually fail, because you are reacting to the noise of the past, rather than the fundamentals of the future.