The xlm price really increased in Q4 2017 , along with other altcoins. Moreover, Stellar managed to hold a decent amount of its valuation when the bear market commenced.
Even though, Stellar price decreased in January 2018, when you compare it to April of 2017, the coin has grown 2,900% in one year! Which is pretty amazing!
The highest point in December was $.31 cents. Then in January 2019, Stellar raised to a new peak growing to its all-time high of $.93 cents.
Although, its possible that Stellar could lose more value against Bitcoin, it is unlikely to crash severely against fiat currencies like the USD.
Lets see the rollercoaster ride of stellar in 2019
Read more here
https://coinpedia.org/information/stellar-price-prediction/