Ok so just my two cents:

}Start freezing at 70 so you can get the free draws on gnw treasure

}DO @9tails but make a "special" team of just your main NO ANBU BUFF PLS + WORSE SKILLS+ NO EQUIPMENT, hit 1 time and leave. This gives around 35k exp from my experience (could be less for you), which goes against the lvl freeze idiea but it's GARANTEED 10 coupons + 1 lvl 2 maga 4x a week and is lots less than the 1st froggy gives in exp daily for more usefullness (talk to group lead if it's ok to not get the 1st froggy since you're freezing, big groups have some leeway)

}No ninja test, no wanted missions EVER; as stated do Jinch rescue but only claim the non exp pack; do cat quiz and hope you get lucky; only do plots on weekends for equipment materials and only ever refresh ninja exam when you can upgrade equipment.. until you jump from floor 80 to floor 100 for example do not refresh once all equipment is upgraded

}Save all things for rebates (cave keys from home tree; refines; charms)

}Make sure you can get as much free coupons as possible saved from freebies on events; daily log-in, etc.

}Best events to spend the saved up coupons are great plates and lucky board; If you need anbu clothes konoha outlet is the cheapest (only) place to get it