Buy bitcoin.
This is the best recommendation that you will here from everyone if you're really for the long term. You're at the right hands if you're going to choose bitcoin before any other altcoins.
It's a saver for everyone's portfolio when most alts are down.
I totally agree with your suggestion, because indeed Bitcoin is the most profitable investment for the long term, so it is true if you say that it's better to invest in Bitcoin before investing in altcoin, because what determines the market will increase or decrease is Bitcoin, so of course investing in Bitcoin is definitely safer than investing in altcoin and now is the right time to invest in Bitcoin, because the price of Bitcoin is going down and hasn't risen very high yet, so if the price of Bitcoin has started to increase very high again and create a new ATH price, then of course you will definitely get a big profit from investing in Bitcoin at this time.