Dragon Ball Super: Isekai Dreams

Prologue

Within Universe 7, there are 3 pure blooded Saiyans still left alive:
Goku
Vegeta
And the latest, Broly
However,...there was one 1 more Saiyan to join the group...
Seler.
Like Goku, who's birth given name was Kakarot, he too accepted a new name upon living on Earth, he renamed himself Moroha.

Shortly after the events of Dragon ball Super Broly, the quartet would train on Berrus' planet. While doing so Moroha would meet Yogen-gyo, the oracle fish. Yogen-gyo would see Moroha's future and inform him of it:
"In the future, you will meet 10 powerful and beautiful women who will each bear your children. The offspring of this large union will shake the foundations of power throughout all aspects of reality and existence. They're power will far surpass any and everything that has or will be.
This...is your destiny!"
Moroha was left stunned trying to process this heavy information. After processing and accepting he grins at the idea of being bestowed such a great destiny and will be the start of a greater blood line than Goku, Vegeta or even Broly.
After this turn of events, Moroha would push his training. Thinking back to when Goku's son, Gohan was born.
He had a portion of the power his father had when conceived. Moroha decided to build up as much power as possible in preparation to his children's upcoming and as he searched for the mother of these kids of prophecy.
Using his 3 Saiyan brothers in arms as pillars of inspiration, Moroha knew how to improve himself. Goku, Vegeta, and Broly...Body, mind and spirit. Something Master Roshi had taught Goku and Krillian when they were younger, but over time would disregard the mind portion. Vegeta picks this up on his own after the events of the Tournament of power when they fought Jiren the grey from universe 11.
Moroha would train all of these aspects of his being to the peak and being a Saiyan, would surpass his limits.
First, he started with the easiest of the 3, the body. Every now and then he would ask the universe 7 Angel, Whis or supreme Kai Shin for a new and heavier set of clothing so he could focus on training in other fields.
Afterwards he would set out to train his mind, increasing his knowledge. Moroha, started thinking outside the box compared to the other Saiyan's. He thought down to the fundamentals when it came to his training such as researching the muscles of the human body since humans and Saiyans share similar anatomy.
Having the knowledge of what all his muscles could do for the body helped further his training. In addition to making small changes to his diet so his body could obtain all the nutrients, vitamins and minerals to ensure the maximum output.
Vegeta, the most intelligent of the other 3 would notice this approach and begin to mimic the tactic in his own way.
Not long after, Moroha started expanding into the Spirt potion of his training, taking the time to meditate. Also trying to mimic what Jiren the grey did during the tournament of power, enabling Moroha's power to flow more effortlessly. Next was acquiring new techniques to fill his arsenal with. Moroha wasn't so caught up in his Saiyan pride to hesitate to ask Goku to teach him the:
Kaioken, instant transmission and fusion dance.
Unlike the fusion dance, which only took a single day to master, it took 4 months just to grasp the concepts of the Kaioken and instant transmission, then 2 more months to master the new techniques.
From there Moroha trained his mind under the smartest person he knew when it came to technological and scientific fields, Bulma briefs for the first 5 months of the year. Another 5 would be spent training and studying under Whis. The last 2, Moroha would spend instant transmission hoping different planets in search of:
1. The women of prophecy
2. Techniques to learn like when Goku went to Yardrat
3. Men whom he could fight or train to give him a challenge one day.
4. Beautiful landscapes and scenery that were ideal for napping and/or meditating
5. And finally, good food and/or resources.

Sadly, most planets had none of the above. Time flew by and before Moroha knew it, he was 50. Thinking it would take longer to meet these women, Moroha collected the 7 Dragon balls and called forth Shenron and wished for the ability to control his aging. With this, he would reverse his age back to when he was 21, affecting/ limiting his physical and spiritual power prior to the wish. The de-aging would upset the self-presentative Bulma. She tried to do the same but was stopped by her Husband, Vegeta.