The history repeats itself, this is a good time to invest as price got even lower than previous months value.
If you are willing to take your changes on this moment don't wait any further (except few days as i believe it will still drop a bit more) and invest / buy.
After the halving i'm positive sure that price will get bigger as previous halving.
That means if bitcoin grows all other cryptocurrencies will surely grow as well as people tend to swap between btc and other alt coins to get some profit during price fluctuations.
That's not possible, especially now that there's a lot of investors proven that it is worth to invest in Bitcoin rather than in altcoins which dumps all the time and hard to rise again, but in Bitcoin, it can survive all the time as this has been the king of crypto, and for a decade of its existence, it is worth it and many investors has proven it and has earned a lot. So, the demand really increases rapidly.