So, you lost some money there, well next game around gamble double of that for earning, now you can't double the wager because even the double wager wouldn't cover that most of the time, you have to double the return, so if you lost 100 dollars, find how much you need to wager to win 200 dollars and wager that amount on Liverpool on the next game, plus if you lose that, wager even more on the next game, how many games can Liverpool lose back to back?
So, like I said the regular strategy may not work but the martingale version that allows you to double your profit after each loss would actually make you a good profit since those huge teams won't lose back to back too frequently.
Except, Liverpool odds are not always 2x So if you lose $100, then double and lose again $200, and then Liverpool finally win when you bet $400 but it is 1.6x then you only win $640 back, nett loss of 60.
So you have to calculate much more than 2x for Liverpool.
P.S. I have hit 1% of total lottery tickets for the first time in my life. Thank you Bonus;)