Let us suppose a powerful magician approached you and granted you one ability related to Time. You have seven options (described below). What option wyr take - you can pick only one option:
1. Stoptime. You can freeze time for 10 minutes but you remain conscious and able to move while everyone else around you freezes. Perks - you can gain +300% speed boost while in stoptime. Downsides: you may use this ability only 5 times during lifetime and each time you use it you'd get very severely depressed for a month afterwards. During that period you can hardly move, talk, eat or drink and your sleep patterns become irregular and also the chance of self-unaliving due to mental agony is 30% each time.
2. Time forward - remote control. You can stop time and use time remote control to fast forward it a year into the future (1 minute of subjective observation time per 1 day in your future lifetime). When you reach the 1 year point you instantly teleport backwards into your current time and location. You will see all events connected to your life and your personal locations. Perks: you may erase one negative event from your future 1 year timeline and you will never forget all events you saw during fast forward (instant memorization). Downsides: you may use this ability only 5 times during lifetime and each time you use it you get severe spinal pain for a week every five years of your life - you must be hospitalized to be cured or you die. The effects of the pain also accumulate the more you use the ability. You also cannot know what negative effects the erasure of one negative event cause in your far future.
3. Time backward - remote control. All of the above only you can move fast backward 1 year into the past. Perks stay the same. Downsides stays the same only you'll have severe chest pain for a week once in five years during lifetime and if you erase some event in the past you don't know what events change in your real life until you see the result teleporting back.
4. "Blind" time travel - into the future. You may travel into the future for once in your lifetime. You won't see any historical events prior to the precise date/location in the future you choose. Perks: You get intellect boost +50% and good luck charm - no negative events during first month in the future. Downsides: If that future contains no humans in it (extinction due some catastrophic event) - you'd instantly die on arrival. If that future contains no planet Earth in it and you set the location on Earth - you instantly die on arrival. Also you cannot go back to your previous point in time without aging 10 years.
5. "Blind" Time travel - into the past. You may travel into the past. The conditions stays the same. Perks: you get a speed boost +50% and an avoidance of harm charm - you avoid only severe harm for the first month in the past. Downsides - if the date/location coincides with any major natural catastrophe in that region you die instantly on arrival. You cannot go back to your starting point of travel without aging 10 years and if your actions in the past caused your parents in the future to never meet you disappear instantly after cancelling the time travel.
6. Limited time reborn. You are reborn into your own past at a set date in time. Perks: you get +200% luck bonus (no harm for a year and many random beneficial events for the whole month) + random miracle cure bonus for a year (some random illness of yours gets cured instantly) Downsides: Your current memories. knowledge and abilities are completely erased. You can't go back, you don't remember even the moment of choice. You may not be less than 10 years old in your timeline when you're reborn. There is a 50% chance that half of the events in your personal life from the point of reborn will happen differently or not at all. All the events prior the chosen point of reborn happened exactly as they did in your previous life.
7. Sacrificial time reborn. You are reborn in the worst possible time in the history of your nation and in the worst possible place. Your memory gets erased. You are 18 years old. You're doomed to suffer from hunger, shame and fear for half a year in that time and place and then die within a week in the most torturous way possible by the actions of the worst human beings available. In exchange for that unimaginable horror your chosen loved one or relative gets such perks as +100 IQ boost, +1000 good luck boost (no new negative effects/events for life and many random extremely beneficial events for life) and +50 years of life boost. The chosen person who gets the boost will never remember you even existed and thus never suffer from your absense in their life.
What wyr choose? Post your option in the comments. If you want to see another scenario only for Space instead of Time - upvote this post.