With BTC sooner or later within these days hitting the 10k mark (now around 9-10k) i cant help but wonder if one can buy BTC and still make a profit or should i just hold on to my ethereum and watch the market due to the fact that it can fall back
Depends on what you believe how the price is going to turn out in the long run. If you think that the price will continue to increase, then there is no harm in buying further. However, everyone thinks a correction or a dip is on its way, so I would be cautious, especially since we are so close to the psychological barrier of $10K.