For me there's no such thing as strategy in gambling it's a matter of win or lose. However there are some strategies on betting not a strategy to win but a strategy to make profit after losing an example of it is the Martingale where in after you lose you need to double your bet and so but you can configure this and make your own martingale strategy using the same concept of course.
In using this you need a bit of luck and a lot of fund.
For you there's no strategy, but there're some strategies you can apply after losing streak? You are a bit contradictory here, don't you think?
There's strategy for every gambling game, because there're different gambling games. In gambling, like in trading, if you rely just on luck you will have more loses in long run. You need to have some strategy, some plan in your head, bankroll management is important, know your bankroll, know your bets and odds, make a plan and try to win, if it's not working today, it will work tomorrow and with good strategy and bankroll management you can recover your loses and make additional profit. Luck is important of course, but's it's not all about luck, you need to have a good approach if you wish to make profit in long run.