The other way of increasing your margin is maxing out on your credit card. You had £2000 which now has the power of £200 so you need to increase it by £18000. If your credit history is fine then you could split the £18000 across say 3 cards. Currently some cards are offering 6% Apr so that...
However if you sold an option for eg SPX Aug put 24700 Aug trading at 4 - 13 at let say £3 stake then what is the margin required. When you use the margin calculator it comes up blank.
Anyone remember sub prime fiasco where there was conflict of interest. Yes Goldman Sachs were encouraging investors to buy the product while the other arm was shorting it.
https://www.theguardian.com/business/2016/apr/11/goldman-sachs-2008-financial-crisis-mortagage-backed-securities
Wait out the opening 20/30 minutes and if the no new low buy the Dow. Also if it shows a profit take half of the profit and let the other half run. For eg your making £400 then take £200 by reducing your stake.
I recommended the book not because it might contain magic sauce so he could accept the short comings of his system.
Also the book works out a lot cheaper then 3K then he was considering paying.