The only reasonable advise for you is to invest in Bitcoin. You can use all the capital to buy Bitcoin and watch your money grow.
You will be able to make reasonable amount but I am not certain that you will be able to make such amount of money you have in mind.
Using just 25k to get 200k is a pure greed and you have to remove the mindset out of your mind. Cryptocurrency is not a ponzi scheme, you will have to invest and watch your money grows.
If we use all the money we have to buy Bitcoin, of course we will be able to get big profits if after we buy it the price continues to increase, but if the price of Bitcoin decreases after we buy it, of course we have to be patient and hold on until the price of Bitcoin increases. In my opinion, it would be very risky if we used all the capital we have to buy a number of Bitcoins, of course we have to think about how to manage the risks that might occur when investing, maybe we need emergency funds and we don't have any more funds at our disposal, of course we have to taking what we have invested before time will of course be very detrimental to us.
You are right, when we invest, of course we will be able to get profits according to the capital we bring and it is not possible to get big profits with capital as you say.