I don't quite agree that many altcoins are rising and showing good growth. Altcoins are rather recovering, they only show growth for those who bought at the bottom. What about those who bought last year or in 2021? There is no growth for them, as the assets have not recovered even 50% of the values they had during the bull run. Still, most investors in the crypto market are still at an unrealized loss.
Yes, the whole market has started recovering value with Bitcoin crossing $30k, and it might be the signal of an upcoming bull run, we have seen that Bitcoin has been pretty stable from the last month after it reached $28k at the end of March, but it has finally moved up a little, so that's surely a positive and we will see a lot of mixed emotions pouring in shortly.
The market started recovering much earlier, a few months ago. While bitcoin reached $30,000, many altcoins have already managed to grow by several hundred percent and give good profits to those who bought at the end of last year. Don't forget about the fact that the current market position can be not a signal for recovery, but the price at the highs, when it is already late enough to buy and the market is waiting for a prolonged fall and correction again. Something similar happened in 2019, the time is just the same, there too until the beginning of May the market was growing, and then it began to fall.