Yes, there are a few ways to increase your chances of obtaining Marks of Grace. Firstly, higher Agility levels can improve the drop rate of Marks of Grace. Secondly, you can wear the Ardougne Cloak 3 or 4, which further increases the drop rate. Lastly, completing the Agility course laps quickly can increase the rate at which Marks of Grace spawn, so focusing on efficiency and agility shortcuts can help you collect them faster.