Cardano, Ripple, and Waves are top altcoins to invest, in my opinion. Because they look very good and promising. I think these will show positive movement in the next few months.
In addition to these Monero can also be a good option. It is number on choice for people active on dark web currently. There a lot of people who would like their transactions to be anonymous and Monero solves this problem for them. Since, a lot of people are actually using this coin, you can say that the price of this coin is real. On other other hand, in case of other alt coins, you might be seeing manipulated prices. The prices might have risen just based on possible returns people are expecting.