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one way is writing off your bitcoins as not yours. that money is not yours to spend. just forget about it. the more you look at it, the more you will just want to sell it especially when you see the value of bitcoin.
do you also do this and does it really work for you?
Some people use this method to pretend they don't own any Bitcoin. They pretend they don't hold any, and even uninstalling their wallet and forgetting about it. This method might work, but I think the best way is to learn to restrain yourself from selling and always remember that you won't lose money if you don't sell because the market will always recover and hit a new ATH. And make a clear investment goal, for example 5-10 years or longer. If someone understands this, they won't panic and try to sell whenever they feel the urge.
I stay on that side too - you don't need to think those BTCs are not yours.
You need to use and hodl them properly, because they are yours, they are in your custody.