I hear you that you say you ask for forgiveness. You don't understand though. You can't ask for forgiveness and then also do an old work of the law.
You have to have faith that Jesus does it all.
Like you said
“I do agree with you that sin starts in the mind and then thought about for a while goes to the heart where it is desired and then acted out...it is sin born”
born like a baby...and well when we are reborn ALL our actions are BORN MORE LIKE HIM HIS...until we are WORKED INTO A CIRCUMCISED HEART AND INNER JEW CHRIST MIND..a.CHRIST IN YOU...having us do AS HE DID...JUST AS...which then FULFILLS THE LAW...we are NOW IN HIM DOING AS HE DID NO LONGER UNDER LAW...
food and drink and special days ARE SHADOWS that help us to become EXACTLY THAT...the rest of our life...as you ALSO said having been PERFECTED JUSTIFIED SAVED BY HIM we then the rest of our life live up to that...HIM IN US...MORE LIKE..
it is actually MORE about REPRESENTING TO OTHERS HIM IN US BECAUSE WE LIVE LIKE HIM...and less about AM I SAVED or not...
do THIS and live...and NOW in this life AS HE DID...love as He loved...abiding in Him living AS He did...and serving others and LOVING OTHERS as He did...
even our enemies...
and when we do this and YAH NOW KNOWS US...well we are NOW prepared to LIVE AS HE LIVES WHERE HE IS...faith first and THEN WORKS HE PREPARED FOR US TO DO...to be MORE LIKE HIM less like our former selves...
to be RE BORN...representing Him His WAY...as Paul says ESTABLISH the Law which is HIS WAY OF LIFE...on earth as it is in Heaven...
and as you said goodness ALSO “starts in the mind and then thought about for a while goes to the heart where it is desired and then acted out” and then it is goodnes born...HIS GOODNESS AS HE LIVED
so living as He did is more about representing Him AS HE LIVED...than “I AM SAVED” so that others might find Him His way too...on earth as He is in Heaven...
so we serve others representing Him LOVING AS HE LOVED serving others loving them as we love ourselves with HIS LOVE HIS WAY thus fulfilling the Law...