I saw that the price of XRP has increased so much. Can XRP be 1 Dollar in 2021?

The scam coin will never worth that much again. In 2017/2018 ripple were using so many money to paid bunch of shillers and spread lies about the usability of XRP coin. It's a security coin from when it was created. XRP is only full with gimmick that being created by its executives.
You should take a look at this
https://twitter.com/Bitstamp/status/1342506058397474822More exchange sites will come to halt their trade for XRP. $1 is just an impossible thing but otherwise, it might possible for ripple to achieved the zero value