Don't let the bitcoin stagnant in your wallet, let it have some transactions. If bitcoins are stagnant the prices will go down someday.
If we just hold bitcoin in our wallet and do not use it, the bitcoin will be useless, so the price will go down eventually.
Supply and demand: the market requires change and transactions to grow.
By not using the bitcoins, you restrict the amount of trading that goes about. If everyone were to stop, then the price would drop down straight to 0.
No demand.
There is no problem with holding bitcoin in a wallet for ages. And this will not affect the market badly as you think. Because there is always buyers and seller.
If more people hold their coins the price will rise because the supply will decline.
But it will not go to 0 as you said because there is always traders
There is a dilemma. The value of the bitcoin comes from transactions. But we want others to do the transactions.