Looks like you've found the coin you're going to invest in, no one can tell you where the bottom of the market will be but look at current market conditions and more specifically Solana, the altcoin you're looking to invest in. I think it's a good time to buy Sol at this price, as it's over 70% off ATH. Since we can't determine whether the market will rise or fall, you should use DCA to be able to buy the best prices possible instead of buying once.