Can you buy a new cryptocurrency after an ICO?

Could you elaborate on the possibilities of purchasing a newly launched cryptocurrency following an Initial Coin Offering (ICO)? Specifically, I'm curious to know if it's feasible to acquire these digital assets directly after the conclusion of the fundraising phase. Additionally, what factors should investors consider when deciding whether to invest in a new cryptocurrency post-ICO? Are there any risks involved, and how can these be mitigated? Finally, is there a specific timeframe or window of opportunity during which investors should act to maximize their chances of success? I'd appreciate your insights into this complex yet intriguing aspect of the cryptocurrency market.