Now its already good entry point, so its possible to start buying (if you didn't started yet) , but only with small percent of all funds. Its better to have money to buy more on the next possible dips 
Buying good coins in a downturn is a very good investment that many people are using but it is important that you choose the right coin to invest because it determines your success. yours. Look carefully at the coin you want to invest to make the most appropriate choice.