Yedia vs Bechira

A thought that I had concerning the age old question of Yediah vs. Bechira is that maybe the answer is to look backwards. We all know that you cannot change the past, however, essentially that is what "Teshuva" does. I think that philosophically  the real "chidush" of Tshuva is that no physical or spiritual being was able to conceptualize and had to be handed down directly from God. Only God could enable a person to change the past. This is also the difference between "Toheh al Harishonos" and teshuva, when you are toheh al harishonos you lose your mitzvos but you are not changing the past. Your are just losing your schar. However when you do thuva you are actually effecting a real change to the extent that "zidonos na'asim lo zachuyos".

Maybe Bchira for the future can act m'idin teshuva, that is to say just like you can change the past through teshuva you can also change the future mekol v'achomer. So if Teshuva works then Bchira must work too even though there is yedia. Just a thought