if you only have $ 5,000, you don't need to buy bitcoin first now because if you buy bitcoin with $ 5,000, you will only get around 0.66 BTC, in my opinion now you better buy altcoin like ETH and then trade to get profit from ETH so you can buy 1 BTC later from your trading profit.
Oh, really this is how it works?
So it doesn't make sense to buy 6 gr of gold either, because you must buy an ounce, on no a pound...a full kilogram!!! That's it! Or...do you need to buy a ton?
Seriously, are you stupid?
If you buy 5000$ worth of BTC and the price of BTC doubles you get double in profit.
If you buy 7500$ worth of BTC and the price of BTC doubles you get double in profit.
Same for any amount of BTC, you don't have to buy a full BTC!
As for OP,
If you have been around this forum for almost a year and you're asking if you can buy bitcoin or not...I doubt any of the above responses will be able to help your cause.