Op is asking about if buying 1 btc is a good long term investment today.
Yesterday its dropped bro! Price will be stable after halving for sure Before that as much you can try to buy a bitcoins and hold it in your secured wallet to make profit without any investment.
and put your earning bitcoins together save that as well...
The price today is dropping so I would say it is the best time to buy 1 btc today or even not one bitcoin as long as you are able to buy one.