 If you liked
Irozuku Sekai no Ashita kara
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 ...then you might like
Majo no Tabitabi
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this is the first time i have written a recommendation so bear with me
both are about witches and at some point they go back in time, majo no tabitabi is an adventure and light comedy mixed with episodes that will surprise you and about funny / sad situations in which she finds herself, while Irozuku Sekai no Ashita is about journey in which she learns to enjoy life. Also both have white / ash hair.