According to Michaël van de Poppe, the altcoin market capitalization is currently retesting its previous breakout range as support. If this support holds, a continuation upwards is likely, potentially leading to a new all-time high (ATH) for altcoins. This development is significant for traders monitoring altcoin momentum, as sustained support at this level could trigger increased buying activity and renewed bullish sentiment in the cryptocurrency market. Source: Michaël van de Poppe.