Generally, gaps in price (whether actual gaps or liquidity gaps) get filled after some time. If the market doesn't go and fill them immediately, I like to wait for highs or lows to be taken. Once stops are taken, the gap should be ready to be filled. TIME does play a factor as with most, if not all analysis.
Looking for a swing of 50+ pips at the moment. If highs get swept and we see price fall lower, I will wait for a potential retracement and enter for a short down to the gap "fill".
Always keep your risk management in check!