I think dont exist 100% safe strategy on dice.
You need to use dice sites for fun this is the best strategy

That's why I said "relatively safe", god.
Mathematically a single martingale sequence is the best and safest way to play on any dice site no matter what house edge, you can find more details on the "does martingale really works" thread.
Other than that all the strategies are the same, literally they all suck equally