I don't have a reason to sell all my bitcoins mined long time ago, I don't want to be rich.
I just believe in this project

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Im not saying to sell all your bitcoins, just a part of them, im surprised you dont wanna to be rich, soo you still with a lot of bitcoins, or had, looks like you had sold your coins and then bitcoin jumped a lot and you miss the opportunity. Makes no sense for me you be able to get rich with bitcoin and just ignore those because you dont wanna to be rich, or you already are rich.
I don't need a lot of money to live, so I don't need to be rich.
"Money is numbers and numbers never end, if it takes money to be happy, your search for happiness will never end." Rober Nesta Marley
I know that quotation, but in reality we can't deny that money is what we want in able to be alive. But for happiness, that's true that sometimes it is not the money that will give us happiness. Instead just use the stored bitcoins that you have for the things that you need.
Even though you don't need to be rich but you need to survive.Exactly, I don't need to be rich to live.