Is now the time to go all in on altcoins?
No investment in the world can be in a perpetual state of growth, I think alts are going to recover some of the value they lost against bitcoin in the last months but I do not think we are going to see another pump in some time, right now we are in the phase were we need to accumulate the most coins possible and position ourselves before the next pump happens.
investments can be short-term and long-term, all depends on your choice. Decision like all in never is good.
First rule of investment is diversification, second - always invest only that you can afford to lose