Hi there!
I want sugestions about how mutiply the BTC with your own gains...
I invest $500,00 in BTC, in variation of BTC (%) I have now $530,00....
I want to know if it's worth to sell those small profits ($30*) to wait a down Bitcoin % to repurchase them again. Or is it very little profit and not worth reinvesting?
Help me understand this mathematics of reinvesting to multiply profits... I'm very confusing about it, and I want reinvest and multiply...
If you're sure that Bitcoin price will fall from the current price ($10870) then yes, sell now and buy at lower price. The only condition if you want to make profit is, that you buy back at at least 1% smaller price so at $10760. And you will make small profit because trading fees are always lower then 1% (usually 0.2%).
But chances are it will never fall to that value so you might be forced to buy back at higher price than you sold. The decision is up to you. My personal opinion is that Bitcoin will fall bellow 10k in next week or two, but don't take this as advice. I could be right, I could be wrong.
And make sure you don't miss the price fall. So the best bet is to open buy limit order at exchange so that you automatically buy bitcoin when it falls to your target price, for example $9900.
The profits of such trading are relatively low though. I would probably suggest you to just keep HODLing if you're a beginner.