To achieve $1 Million by investing Bitcoin, you need around at least $200K since if Bitcoin made new ATH at $100K, it mean the price already 5x times more higher from your beginning capital.
If you want to achieve $1 Million by just using $10K, then you need to be patient since you need to wait the Bitcoin price x100 times more higher than the current price e.g. $2 Million.
Don't think to made instant profit, you can just do DCA-ing to buy every dip of Bitcoin until you reach $1 Million.
The initial $10k fund won't reach $1 million, I think the OP is too ambitious to reach the impossible target in the future, maybe he should lower the target to $100k it might be realistic to achieve when BTC will hit ATH.
I agree with your opinion, currently the price of the top coins has decreased significantly during the bear market but we should use the DCA method to minimize losses, I apply 3 parts to buy when price signifies recovery, when price stabilizes and buy more when price is lower.