$10k is very easy for ethereum to reach that price. Ethereum just need 3 days to rise from $2k into $3k so about the price ETH in the end of this year my prediction ETH will hit more than $15k or maybe it could be more than $20k.
20k is unrealistic price because its almost 10 times the price right now, maybe 10k is more realistic, even if eth can rise that much in just 3 days but its happening only when eth is in bullish.but if its 10k eth can let its price slowly and reaching 10k in maybe 2-3 years or even shorter if its helped by nft hype or the next hype.