It is never a good time now to buy bitcoin.
If you cannot wait for 1½ years, at least wait for a month.
Bitcoin at $10,000 is only a self-delusion - the logic is inconsistent.
Bitcoin is all about buy-low sell-high - nothing about buying bitcoin (viz other crypto) for its "especial" value and to
HODL. Buying bitcoin now to hold and handing them over to your grandsons is not an investment strategy

You must have bought at lows before you could sell at high. Come bitcoin $10,000.
Why should there be such buyers for bitcoin at $10,000 when you yourself are already off loading.
This logical inconsistency means there never will be a bitcoin $10,000 - there is no bitcoin $10,000 to celebrate this Christmas. Only gloom for those invested in bitcoin above $6000.