The BTC has made history today and broke its all time high record. It is currently trading around $ 20500 to 20600. BTC Dominance Index is around 65% which is very High. I personally think that it is the Right time to take entry in Good Alt coins ( Ranking from 2 to 20 on coinmarketcap). I believe that History of 2017 will be repeated soon. We will soon witness Huge rally in Alts. It should happen when BTC will stabilize around current levels and BTC dominance Index comes down to below 60%.
Nowadays it is a good time to buy altcoins, but it is better to choose the good ones. It may be perspective and interesting to search for new startups that can come to the market and make the boom there. I have not participated, I saw it very late, but there was not so long ago such project the Graph - from the first day he got the good strong position in the top 100 on the coinmarketcap, lots of people who were lucky to participate in it got good results. It is like the one of the examples. There are interesting new projects nowadays.