Now that you have more time I would definitely encourage you to stay on. There are many people on here I know of who have hit their own little brick walls in the past, only to keep on going, not give up, and make a break through. Maybe some other members here can back me up on this if they see it? 🙂
In answer to your other question, It is possible to stop your subscription any time and then re subscribe, however, I think regular practice even if it is just ten minutes a day is the answer and most who unsubscribe do not come back, they just think they will! Just re-evaluate your available time with your harmonica goals!
Again, in the end this is your decision, but I say don’t give up!