What you did is not bad, some say that micro-profits in sports betting is a waste of time or something like that, but it is not like that,
A profit is still a profit even how small it is. Anyone saying that micro profit is useless are those gamblers that doesn't hvae patience to grind small profit and typically those losing big time because of their greediness. Microprofit is hood if it's consistent and high win chance rate.
It should be noted that I do the martingale only 1 time, maximum twice , this so that I get over the idea that I did it , sometimes it is like a temptation to continue using the martingale , but we must be very careful , when I lose them, I'm looking for a game bull, and I don't force the one that was there anymore , and I go to a game like crash or Something like that, this to mislead my brain.
Martingale on sports betting is a good idea because the result is based on your analysis. Your lose streak will always depend on your skills and not by luck so Martingale will work on this gambling type. Your strategy is good because because you start low that gives you a lot of chance to recover when you lose a couple of bets. This requires patience but this strategy will work if you can maintain as is.