Some ideas for different fics, if anyone is looking to pick them up just send me a message.
For a Time-Travel fic, have Sasuke implant his Sharigan in Naruto and teach him the Izanagi, combined with Kurama enough chakra to go back further in time. Can do this during Madara or Kaguya fight, up to you. The Izanagi would allow Naruto to write reality and return to his younger self. If you want to send an older Naruto back and have 2 Narutos, have the Izanagi be preformed in conjunction with the Hirashin.
For a Uzumaki clan fic, have a young Uzamaki who survived the destruction of the Whirlpool by using the summoning jutsu without a contract. This can be done either through desperation ir ignorance. I would go with a 9 year old who is training to be a ninja trying to replicate what another ninja did to protect the home. Use whatever summons you want (I like Octopus/Squid for Uzumakis, got the ink/fuin combo, plus Water Nature and could have cool kenjutsu style as well). Uzumaki OC leaves after either completeing their training in the basic summoning clan techniques or up to learning their sage mode, depending on what time period you want to use.
I like just post Third War, meets Minato and Kushina and OC travels around to find survivors, finds a few kids and then rushes back after Kyuubi attack. OC raises the kids and Naruto, (pushback from council because OC from different village but Sage/Sealmaster who is clan member is best caretaker for a jinchuriki).
Uchiha Fic: Either OC character or choose any Uchiha. Their Mangekyo ability is Foresight, by sacrificing sight in one eye to see how future events are meant to unfold, basically gaining knowledge of Canon. Then seeing how the character decides to change them and who they trust.
Not a Fic idea but a take on MoD title. I dislike the whole Death as an entity that is subservient to Harry, calling him Master. I prefer Master of Death, being comparable to a Charms Master, meaning to hold all 3 Hallows makes you a master of Death. The Hallows give you the ability to kill, avoid death and communicate with the dead, giving you a Mastery of Death. The hallows are just extremely powerful magical artifacts that made the Peverell's unparalleled at the time, leading to people saying they had mastered Death, over time this becomes legend feeding into the whole MoD idea.