I think this “hint” is very dangerous. We have absolutely no idea how the price will develop, so it is impossible to say whether we are at the start of a rally or have already reached the top of a bull cycle (I personally don't think so). OP will also have given some thought to such sums.
Yeah, that's totally depend on the OP's mindset I just shared my thoughts as I think we are not at the top of the rally yet, but I do think that bottom is coming and it all depends on the need and profit requirement of the OP if he want to go for long term or for short term. As if he wants to invest for shorter period of time then definitely its a good time as market will make a new ATH and when it will make he can book the profit and exit otherwise he can invest now by doing DCA and till bear market he would have accumulated a lot of BTC.
And he would be in good profit until next halving or bull cycle. Choice is of OPs and speaking of buying such amount I doubt op is for real, but I just can't judge a book by its cover so maybe OP have that much of money and he really wants to invest it in BTC. I suggest him to invest periodically but if he wants to go lumpsump which he can't as due to the limits you already spoke of.