The reversed Nine of Pentacles suggests that although you are investing a lot of time and energy into your relationship, you may not get the desired result. There are obstacles in your path that can prevent the relationship from evolving into something more serious. There may be external factors affecting the relationship, such as other people or circumstances. Furthermore, it can also mean that you are afraid to commit and make an important decision for your relationship.
The Knight of Cups suggests that you have the option of turning your relationship into something more serious if you want. The Knight is ready to embark on a journey and face all the difficulties that he may encounter along the way. This card also represents the ability to be open to new opportunities and to make decisions based on emotion. Hence, this card suggests that you need to consider your feelings and emotions before making an important decision for your relationship.
Based on the information provided by the two tarot cards, it seems that there are obstacles to overcome if you want to transform your relationship into something more serious. However, there is also the possibility that you can do this if you have the courage and will to face the difficulties and follow your feelings. So, the answer to your question is probably "no", but how you proceed is up to you.