I am Intending to move away from StashAway. Should I slowly pump the asset I have accumulated over the 2 years from StashAway into Syfe, or dump it in one lump sum?

There's no right or wrong answer to the lump sum vs DCA debate. Ultimately it all boils down to what you're comfortable with and what can help you sleep better at night.

Time in the market is more important than timing the market, so whichever method you choose will be better than sitting on the sidelines holding cash. Hope this helps!​​​

Read thefrugalstudent's answer - sums it up very well.

Consider if you want potentially higher returns by gaining market exposure ASAP (lump-sum shown to beat DCA generally) or you want to mitigate volatility (DCA does this).