Bitcoin's market dominance decreased from 65% to 61% between May 7 and May 13.Altcoins are showing bullish signs as they formed a golden cross in May, indicating potential bullish momentum.In 2021, altcoins saw significant gains during the altseason, with some popular options returning up to 28,000% by the end of the market cycle.The total altcoin market cap could exceed $5 trillion by 2026 if the current performance mirrors that of the last market cycle.