Firstly, it only takes that the past, present and future to co-exist for there to be a means of moving from one to the other. That there is significant matter and energy that does not obey the exclusion principle suggests that routes between all points of time and space are conceivable and potentially feasible.
Secondly, there is obviously more than three dimensions. Only one additional dimension is needed for it to be feasible to move to any point in three dimensions.
Thirdly, the whole universe may recycle and obey the law of complete determinism either wholly or statistically.
Fourthly, we know that plants now use the quantum world to survive, and it is logical that humans and animals do so as well. The quantum world may be much more effective in recreating universes than we can ever imagine.
Fifthly, the world may be be like a holograph and be a projection within a projection, each being identical and each self referential.
Sixthly, we have evidence of mankind guessing the existence of life after death and I am not so stupid as to doubt the belief of so many over time.
Seventh, what goes forward also goes backward even though we may not be aware. In mathematics this is facile. Our reality may be that what experience is simply are the product of mathematical abstraction, as in the case of being a strange loop.
Will ye no think kindly on those who would be your friends! May the sun shine with your thoughts, today, and happiness grow in your heart! May you allow yourself some peace of mind.