Where can I exchange my BTC to ETH without KYC and a minimum amount? (I need to exchange 25 usd roughly worth of btc, or 0.00043332 btc)
Where do you live?
You can use Binance. You don't need to fulfil KYC for a certain amount.
And it is enough as minimum trading of ETH/BTC
You can check the full trading rules of Binance right here:
https://www.binance.com/en/trade-ruleHowever, one to remember, does that 25USD is the amount after reduced by the fee of withdrawing your BTC from your initial wallet to exchange? because, you also need the fee and AFAIK, the fee of transferring BTC right now is very high. It is better also to consider about this.