[jraedisch]

If you stay in the "new" past, you can just enjoy the fruits of your labor. If you jump back to the future by conventional means, like hibernation/cryogenic sleep, you will wake up in the same changed universe, including altered versions of the loved ones you left behind (if you are lucky [or unlucky if they change in a bad way]).

If you jump back into the old universe, nothing will have changed – so that is pretty much the only place you should stay away from.

There won't be a future where people knowingly will have experienced the results of your heroic deeds, which might be sad to some, but you can just tell/try to convince them of what good you did. Maybe take some videos or other proof.