the thing is: if you have a system you should follow your system no matter the condition
but you are right that for some people it's harder to follow the system specially after big wins
they get too euphoric and happy, go out running and get hit by a train (lose it all again)
Managing our money responsibly is very important when it comes to gambling since our money is what allows us to gamble at all, so we cannot use it irresponsibly.
If you are an average gambler and you do not have a winning strategy then you need to have some kind of limit that when touched it will mean the immediate end of the session, this not only protects your capital but it also demonstrates to you that you have complete control over your gambling and that you are not suffering from any problems related to a gambling compulsion.
What do you mean by winning strategy? There is not any such strategy that we can apply to slots as we only need to be lucky in these bets and outcomes are in front of us.But yes you need to manage your funds properly in betting to avoid any financial problems and continue your bet.