So, is strategy only for betting, such as analysis and skill? If bankroll and emotions are not included in the strategy, then you could be ruined because not controlling your finances is not part of the strategy.

In my opinion... bankroll is part of the strategy at the beginning, even though you will eventually lose the bet, it can still limit you, and indeed, in the end, we will lose the bet, but by managing the bankroll, the loss will not be as big as imagined.