This text (Galatians 3) is not a text that helps you. Let's look at the text:
But before faith came, we were kept in custody under the Law, being confined for the faith that was destined to be revealed. 24 Therefore the Law has become our guardian to lead us to Christ, so that we may be justified by faith. 25 But now that faith has come, we are no longer under a guardian.
The guardian here, of course, is the Law.
Now we will all watch as you try to convince us that the Law is only retired in a highly limited sense. Well, of course, Paul does not qualify his statement. But no doubt you will.
Much like how, in service of your position, many will argue that when Paul says we have been released from the Law (Romans 7), we have really only been released from the role of the law in judging us, but that we still have to follow it.
Funny, though, Paul says we have been released. Period.
Furthermore, the Greek word "paidagogos" is used in this text from Galatians and is translated as guardian.
What is a paidagogos? It is a form of male babysitter that care care of the young until they come of age.
What happens to the paidagogos then?
Guess what: they are out of a job. I trust the point is clear.
The problem is that you appear to have skipped the whole training process for becoming a son in your doctrine, (which is the typical result of mainstream anti-Torah theology), and have counted yourself a son without having undergone the training process prescribed in the Torah, Prophets, and Writings, and also by Paul himself here in this passage.
The passage doesn't end with Galatians 3:29, in fact, the conclusion to what he is actually saying has been cut off by the man-made chapter break between chapters three and four.
Galatians 1:1-2 TS2009
1 Sha’ul, an emissary – not from men, nor by a man, but by
יהושע Messiah and Elohim the Father who raised Him from the dead –
2
and all the brothers who are with me,* to the assemblies of Galatia:
*Galatians 3:23-25, we*, our*, we*,
Paul "and all the brothers who are with me"
Galatians 3:21-4:2 TS2009
21 Is the Torah then against the promises of Elohim? Let it not be! For if a torah had been given that was able to make alive, truly righteousness would have been by Torah.
22 But the Scripture has shut up all
mankind under sin, that the promise by belief in
יהושע Messiah might be given to those who believe.
23 But before belief came,
we* were being guarded under Torah, having been shut up for the belief being about to be revealed.
24 Therefore the Torah became
our* trainer unto Messiah, in order to be declared right by belief.
25 And after belief has come,
we* are no longer under a trainer.
26 For you are all sons of Elohim through belief in Messiah
יהושע.
27 For as many of you as were immersed into Messiah have put on Messiah.
28 There is not Yehuḏi nor Greek, there is not slave nor free, there is not male and female, for you are all one in Messiah
יהושע.
29
And if you are of Messiah, then you are seed of Aḇraham, and heirs according to promise.
01
And I say, for as long as the heir is a child, he is no different from a slave, though he is master of all,
02
but is under guardians and trustees till the time prearranged by the father.
So then, having entered into the faith, one is counted as a babe or child "in the milk of the Word", though he or she be set to become a master of all, having been counted as an heir.
But until that time, the time appointed of the Father when a child becomes a tried and tested son, the babe or child is under a trainer, (the Torah), and is under guardians and trustees, (Prophets and Writings).
Moreover the heir is according to the promise, (Galatians 3:29), but the promise cannot be received unless and until one has done the will of Elohim. This is expounded for us in Hebrews 10:35-39, and Paul also speaks of doing the will of Elohim, by way of the commandments of the Master, in 1 Thessalonians 4:1-8.
This is not me inserting my paradigm into the text. This is simply a straight reading of what Paul is teaching here.