Sure, I can recommend you some good anime that fit your preferences. Based on my web searches, some of the best anime that combine fantasy, science fiction and time travel are:

Steins;Gate: A thrilling sci-fi anime adventure full of surprising twists that keep audiences guessing from start to finish. It follows a group of friends who discover how to send text messages into the past and end up altering their own reality in unexpected ways.
Inuyasha: A classic fantasy anime that involves a high school girl who travels back to feudal Japan and joins forces with a half-demon to collect the shards of a powerful jewel and fight evil.
The Girl Who Leapt Through Time1: A charming and heartwarming anime movie that tells the story of a teenage girl who gains the ability to leap through time and uses it to fix her everyday problems, but soon realizes the consequences of her actions.
Re:Zero - Starting Life in Another World: A dark and intense fantasy anime that follows a young man who is transported to a parallel world where he has the ability to rewind time every time he dies, but also has to face the horrors and tragedies that await him.
Erased: A suspenseful and emotional anime that revolves around a man who has the power to travel back in time before a life-threatening incident occurs and tries to prevent a series of murders that happened in his childhood.
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