Since prices are down, I am going to spend some money for shopping. Not a lot, just what I can spend.
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?
Since you already hold some other coins but no bitcoins yet, I would strongly recommend to buy some BTC. Right now the BTC price is cheap compared to last year. If you can buy BTC below 30,000 USD it's a good deal on my opinion. And BTC as the oldest crypto coin should be part of any crypto portfolio. I am assuming you are looking to build up a long term portfolio and not only want short term gains. For that BTC should definitely be part of your wallet. We don't know which Alt coin will be successful long term, but we know that bitcoins will still be around in the future, it's never a bad investment.