just start slowly again, don't rush anything, with time you will see what you need.Just stack pos1 if you got OKAY-ish ninja and you should be fine. Myoboku is good raw power function to invest a bit

First of all do all your dailies daily so you get max sun/moon coins each week. First finish off assist links (4x lv9) on your move1 ninja, then redeem keys for moon and charms for sun coins. You want to ALWAYS participate in key rebate, 1050 each month. Leftovers can be spent on either more keys or bells to slowly upgrade other assist links to at least lv3, then 6. Redeem medium refines in monthly, space time and medium threads (if you arent past medium level) in space time shop. As for advanced refines, only free from events like fateful encounter, sakura gift or optional refine pack- its not worth to prioretize them as there are other functions that can be upgraded faster and yield better results. This will take you a year or so but try to save 1353 adv refines, so you can instantly upgrade refine 7->10 during rebate. ALWAYS USE REBATES, NO MATTER WHAT POWER FEATURE IT IS!

Charms: participate in x500 rebate, get ninjas to lvl6, then focus on maxing position 1.

Runes: get everybody to lv 6, then all into move1. Move1 should always be around 3 levels higher than other ninjas, but dont neglect your other ninjas.

Whenever possible you should redeem myoboku training/grasp/gift, up to map lvl12 they give awesome power boost for really low cost in comparison to other features.

Summon cultivation- get runes whenever possible (myoboku has more priority), but do it for free mostly. If you have 1 team you are using, upgrade that summon first to 5-6/8lvls, then upgrade others equally according to cost, priority with order should always be initiative tile > others.

Chakra training- you get free cultivation scrolls here and there, but dont spend there. Just use free ones, its rather endgame feature.

Regular coins priority: group skills, then equipment upgrade, then 8gates. Donate max and and spin the wheel. If your group has max lvl wheel (14 spins) you get ~30cp/day on average. If you are in a bad group, consider joining stronger one to get easier time during playing.

Team: if you have pretty good team, then redeem only power options in events. If not, you need to start redeeming free frags of the best meta teams (currently propably naruto 6paths). Usually move1 ninja is enough and you can make more or less optimal support for him with free/treasure ninjas.

Seals: save 264 and participate only in x300 rebate. It has the best return value.

Up to now I always said free stuff. So no spending cp. Save coupons, preferably 20k to participate in fukurokumaru deals. That (without spending $ for ingots) should take you 3-6months, depending if you successfully plunder or get plundered on daily basis. For spending 20k you usually get pretty good ninja, essence, and 5 to 10k worth of power items. And those are just cp spending rebate benefits, you also get what you buy for those 20k in other events- once you get to that ammount I'd recommend to ask for top tier meta teams in forum ,so you can buy that ninja during rebate (if not that week, then next cycle). Basically, you pretty much never want to spend coupons in larger ammounts, because its not optimal.

If you plan on recharging, monthly card 300 & 600 is the priority (6:1 cp to ingot ratio gain). Second priority is naruto froggy with 430:100 cp:ig and 12600:5000 cp:ig ratio (you usually want to buy both if you can afford that). Dont spend ingots directly, unless you are a whale. And recharge only during good events, not crappy rng ones like slot machine. Platinum recharge for that matter is one of your best friends. Mentioned spending methods allow you to participate in 20k fukurokumaru each month, instead once every 3-6.

As you see, everything there takes an awful lot of time (or resources). Good luck in the grind :P