You shouldn't wait more time, you saw the pump of altcoin in 2018. You don't want to miss next chance. Here MIOTA, Waves, Powerledger and Stellar Lumens is the best. You can buy some coin from new technology and blockchain.
There is no need to invest in waves, because for me this coin has died long ago, I do not understand how it is still in the top, other coins are good and promising