 If you liked
Tsuyokute New Saga
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 ...then you might like
Ragna Crimson
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The premisse is very similar. Both of the protagonists have somewhat failed in achieving an good future, although have survived til the end and going alone in the journey against the "bad guys"
Tsuyokute the protagonist only retains his memories, and use its to become strong and save his loved ones from the war against the big bad demon lord.
In Ragna Crimson the protagonist retain all (or at least a big portion of it) his past powers and uses it to fight the dragons.