Do you mean to tell you about the best methods for buying? I'd use one of the top crypto exchanges, but be ready to pass KYC.
that's the problem with this thread there is no clarity if what is really asking by the OP we all speculating about what is the true needs upon asking this.
but you have mentioned exchanger on what?of course only exchange can offer us Buying and selling not unless P2P options.
better for Him to use either exchange or if there is some place like Local wallets(if available in their locations)
for OP buy now or be late next year since halving is coming.
We might get confused about what OP is really asking but since there are already suggestions about exchanges, I think what OP is asking is what particular coin or cryptocurrency could we buy from the money he have, I am not really sure if he is really telling the truth about spending that huge amount, but what I can recommend to you at this time is to wait further, The market is at 6850$ per bitcoin as of the moment based on the CMC, and I see it will continue to decline a bit, so you, having 5000$ would be great if you could wait till the price meets your funds, so, you will have exact 1BTC for you to hodl and you just need to wait for profits.