I think we still have time to invest in Altcoin. Because I come to this conclusion when I examine the prices. In general, many projects have come down to the initial price. Prices rose slightly in the last week. There may be a retreat.
The answer should be anytime and it's just not we have the time. The bullish trend has been showing its power again after a few years of dump. This cycle must happen to make the market becomes stable. Only bad projects that were getting dumped again to the initial price but the major coins are still getting traded above the initial price.