Now the question is, should I buy BTC (currently I don't have any BTC) or should I do DCA for ETH, SOL or DOT?
BTC is the first choice and the main asset to have for investment. The value is clear enough with that high market cap. Although nobody knows the future, Bitcoin has the biggest chance to rise up and create a new ATH in the future.
If you think it is enough to have BTC, you may diversify again your money into some altcoins with higher risks if you want. ETH and DOT are also my choices. But never follows what other people do. Just make your own research from now.
Make bitcoin as your main where you do accumulate as much as you could and also whenever it do declines its price then i would be mainly minding about DCA'ing bitcoin and whenever i do see some opportunity on
some altcoins then this is where i do make out some consideration on taking some altcoins for me to invest on but of course it would really be depending on your funds since this one requires capital.
Not all does have the capital to invest on thats why you should really be wise on making out decisions something like this whether it would result into positive or not.