The top 5 altcoin is less than $ 1 that I think we should invest in is Stellar, IOTA, Cardano, Tether and TRON. These are the top altcoins, they have growth potential. I like IOTA.IOTA has advanced Tangle technology, it has very fast transaction speed and low transaction fees. IOTA's leadership team is very professional. I believe in the future IOTA will grow strongly.