Not knowing your exact buy rate but as I write this BTC is making a correction (USD 13,951) but we all know that bitcoin always turn out well and beat the previous ATHs .although I am no expert but I would say to hold on for a while let BTC recover itself , as you will be able to get more IOTA from lesser BTCs when the price is high...
Now - IOTA is also on a climb but the weekly chart tells that the corrections are more compared to the rise .
Hold BTC , let it recover a bit and if you see IOTA rising exponentially you may jump and buy IOTA.
Currently you can buy IOTA only from Bitfinex , so you will need to transfer your btc to bitfinex and convert them to IOTA
Happy Trading !!!