Is it a good time to buy Polkadot?

Could you please offer your insights on whether it's advisable to purchase Polkadot at this juncture? Given the current market fluctuations and Polkadot's performance trends, is it a lucrative opportunity or should one exercise caution? What factors should be taken into account while making such a decision? Also, could you elaborate on the potential risks involved and any long-term prospects for Polkadot? Your expert opinion would greatly assist in making an informed choice.