What is the cheapest option

Hi, I’m going on a trip to Japan for a 28 days and I don’t know what is the best option for me with the Japan rail pass because it’s just for 21 days so I want to know is there a better option for me.
My trip is going to look something like that:
Day 1: landing in Narita, from there I’m going to fukuoka
Day 2 -4: Fukuoka ,side trips Nagasaki, Sasaguri.
Day5-10:tokyo, side trips Disneyland, m. Fuji, Niko.
Day11-12:Nagoya,side trip to Ise shrine
Day13-14:Takayama
Day15-16:Kanazawa.
Day 17-21:Kyoto,side trips nara and M.koya.
Day22-24:Osaka, side trip to Himeji castle
Day 25-27:Hiroshima, side trips to Miyajima and Daishoin.
Day 28:back to Tokyo and flying back home.

Which type of Japan rail pass is better and if not Which is the best travel option for this trip?