I only invest on altcoins for half of my btc, because we don't know the future - BTC might hit another ATH and we'll probably regretting it because we don't have enough of it on our bags.
Actually what you have done is a very good and extraordinary thing, but you also don't need to hesitate about the future of Bitcoin because rare items will always be more expensive in the future, as well as Bitcoin.
BTC is not comparable with altcoin dude. You should also think what will be happening when the price will be going down again. People should think about how they can take the advantage from this holding rather than try to hodl it for the long term but it will be going back again without getting any profit from the market.
Altcoin is not so rarely like bitcoin.