Yes, keeps adding Bitcoin aside from altcoins because this is the safest and most profitable in long term investments and we should learn to wait and support legit coins than those Pump and dump project that will surely make you hit the ground if did not take the chance selling in hyping season .
Do you mean only focus on buying Bitcoin? I don't think we need to ignore altcoins, altcoins also have a good potential profit. But we must be careful to choosing altcoins to buy. Don't buy altcoins that have no clear fundamentals, especially those new altcoins. It is better to buy top altcoins that seem to have a good future and are supported by most crypto users.