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. We can analyze the volume of its transactions on exchanges to know how well people support those altcoins.
We are not going to ignore altcoins but let's allocate a large amount to bitcoin and only invest in altcoins with sufficient amount. There are many potential altcoins that can give very good returns, sometimes the return is bigger than what bitcoin gives us but the risk is also huge because most will only increase when bitcoin goes up, all depends on bitcoin. Totally agree you don't risk new altcoins, just focus on top altcoins, big enough altcoins.