1. you can take rise and invest in any trusted coin less than 1$ like :
A.
cardano:
$0.826150 $239,940,000
B.
tether:
$1.01 $2,855,360,000
C.
dogecoin:
$0.012417 $57,851,600 112,732,830,712 DOGE.
2. Use some High privacy coins like Monero and Zcash because in future we will need some privacy when using virtual money.
3. it is better to invest wisely and buy some LTC or ETH
What is the benefit of holding tether? It's value will never increase more than a dollar, and in rare case if bitfinex screws something with it, it might vanish.