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
you'll never know if btc or other currency will rise or drop. personally, i think that it will be cheaper for a while, but you'd better read other opinions too

Indeed, we don't know for sure whether bitcoin will continue to rise or get corrected and fall below $9K again.
Consider some development and acceptance for bitcoin in some countries, especially in South Korea and CME plan to launch bitcoin futures which may attract more investors (big whales) to invest in bitcoin as well. In this case, bitcoin may continue to reach $11,000 in December.
Is this the best time to buy bitcoin? a tricky question, as the best time maybe when bitcoin was $0.03 8 years ago.
If you want to convert eth to bitcoin, hopefully, you did, as bitcoin % increases higher than ethereum in the last few days.