That's because you wasted your resources. Now you know how the game works and hopefully you know also how to mitigate bad luck, if you don't know how just ask here and we will give you an answer.

140 scrolls used in sage treasure were wasted resources.

You got the luck of the devil in pulling darui in kage treasure, but maybe you aren't aware about how lucky you were in pulling him, so now stop dropping seal scrolls in other treasures and go up to ay 3rd in lightning treasure (are around 210 scrolls, if you didn't use 140 in sage treasure now you would be very close to get him). In the meanwhile use coupons for power only. At that point you'll have a viable meta team with darui samui and ay 3rd with midnight blade or crimson fist and you can laugh in the face to the people that pull that jonin minato by directly nuking their main.

About mitigating bad luck, one example could be to not ever try once to test your luck in a wheel or in any event that put something there with a 'chance' to get it.

Do you badly want a specific ninja? Gather coupons and buy directly it in events that sell him fragment per fragment so you know how much it costs and you are sure to get it.

Use your resources during rebates only and take for granted every lucky roll is there goes bad (tactics, battle armor, refinements, charms) so that if you get a lucky roll it's something gained and saved up on your schedule and not something on which you betted on.