Investing in Bitcoin now is not risky at all despite that the price surged to $100k, if you were observing the market, you will notice that the price once drop to $90k+ even after surging to $104k. So, if you had buy then, you will still be in profit as the price got back to $100k. You think that altcoins is the right choice to make now because some of them have not pumped but I doubt if you can be 100% accurate of the altcoins that's will pump, you will end up putting your capital at risk by investing into an altcoin that you are not sure will pump.
As other have said, it really depends on your purchasing power, if you have a bigger funds then I wouldn't risk it on that alts the OP are trying to promote. We all know here that altcoins are riskier as their market is very much volatile and there is this sort of pump and dump scheme that if you are already investors, you might be late if dump happens because you are sleeping and it's obvious because of the different time zone.
Although there are solid altcoins, those who still enjoy the consensus and the support of the altcoin community, they could be old but still they are in the top. And then there are altcoins that has the current hype and that's where some of the altcoins investors, who loves risk are going to invest. But not to a unknown like MOZ who I don't see any hype at all.