The “take profit” strategy generally involves selling some fraction of your holdings each time the asset reaches a new all-time high. For example, a take profit strategy may be to sell 10% of your holdings every time the price exceeds your previous sell price by 10%. You can combine this with a buy back in strategy.
That seems a simple strategy but you would really need to stick to that plan as I think greed will start kicking in when the price keeps rising and rising. Another strategy could be to sell 50% of your coins (or slightly more) when the price doubles in value. The rest of the coins, you can like see as free money.