Bitcoin kicks off the year on a cautious note, with bulls and bears playing it safe. Market volatility is expected to rise as traders return from holidays. Biget Research's Ryan Lee suggests Bitcoin could hit $120,000 before profit-taking occurs. While optimism surrounds Bitcoin, Ether might not see significant rallies in 2025, according to Markus Thielen of 10x Research. Investors are eyeing the potential approval of a U.S.-listed Solana ETF, which could boost Solana's prospects. As the market evolves, key support and resistance levels for Bitcoin and altcoins remain crucial for traders.