That's the thing about the martingale strategy, it doesn't really depend on the amount of your bankroll, but you also should factor in your luck as dice games are one of the common gambling games that depend on it.
Anyway, if you have been really used to playing with the martingale strategy, you should know that you need to set your starting bet much lower than that especially since you only have 100$ to play on. It's pretty common that we can encounter a 5-10 losing streak on dice and you should at least factor that out. I've been using that strategy for quite a while, and I mostly profit from it every time. Patience is a virtue and knowing when to stop are things that you should have when doing the said strategy.
I've lost almost more than 10 consecutive dice rolls with automatic spins and spent my money, it's because of my carelessness not setting the stop button to limit losses, but from that I learned that playing dice rolls not only uses technique but also luck, assume only if I lose it's my unlucky day
I find this one as a good strategy as well in playing dice, especially if I want to gamble with a specific amount only per bet and Im kinda focus on getting some profit but its not always my strategy. I do net manually as well but I find this time consuming most of the time because in auto bet, you can do other things at the same time. This strategy is very convenient but of course it doesnt increase the chance of getting profit.
back again to the point I said after that sometimes luck gives us an advantage in that game, even though we have hundreds of techniques though and it is important to remember that we are fighting machines not someone we can possibly beat