How do I consistently maintain a 68%-72% humidity range with my cigar humidor?

I recently purchased a cigar humidor that holds up to 75-100 cigars. I have read all kinds of ways on how I should properly season the humidor. At first, I used my activator solution on my humidifier and placed that in the humidor. Then, I simply put a shot gl with distilled water in it and let it sit for almost a week. The reading on my hygrometer has not reached above 65%. Then, I decided to put another shot gl in it, along with a sponge. I also wiped down all the sides and the wood tray with the sponge to let the water soak into the spanish cedar. This has helped the most because the humidity has reached 70% humidity however continues to fall back down within 6 hours. I have not put my cigars in yet because I was expecting the humidity to stay consistent around 70% humidity (at least a month). I just changed locations and put my humidor into another room in my house to see if the humidity level was just bad in my room. The humidity in my humidor has been consistently in the 60%-65% humidity range. However, I would like it higher. What do you recommend I do to have my humidity level in my humidor reach a consistent level of 70% humidity?