Yes you can still make profit out of investing in bitcoin now, in fact you've come at a right time if you want to invest it now because bitcoin has just dropped down from its $19k ath and dropped down recently to around $15k-$16k so there's still room for you to make profits once it will start to increase back again. Hopefully it will reach a new all time high and that would be your advantage.
I do not think that you may get the profit or not with investing on bitcoin but today we are finding little dump in the chart so GP to invest now buy the bitcoins with the cash all you have now. With in a week you will find the bump again the chart. Last time also we noticed hard fork effect pulls down the btc and then sometimes after a week it bumps. This time you will find the same.
I think it is the right time to invest in bitcoin if you have money and dare to invest because I remembered 3 months ago many people asked this question that is it late to buy bitcoin when the price was about 4000 dollars, and now the price is about 19000 dollars. Those who have invested in bitcoin 3 months ago earned about 15000 dollars against each bitcoin. Can you imagine the profit? It will happen in the future.
this rise you are mentioning was a unique one which means it is rare. it won't be like this forever that price goes up crazy amounts in the same time frame so it is best not to plan on it. but the rise will surely happen. things are just getting started with bitcoin.
i am looking at the mempool now and i am seeing it is half of what it was last week. this means the spam attack is stopping and soon the fees will go back to normal. additionally with all the improvements that bitcoin is going to receive such as LN you can be more sure about the future rises.