I rather doubt your claim to Jewishness is any greater than Paul’s. He was a Jew of Jews, of the tribe of Benjamin. I would dare say, he knew Judaism and the law far better than you, of the strictest sect of Judaism (Pharisee).
He lived two thousand years closer to the truth about this issue (Jews, Gentiles, salvation thought Jesus Christ alone) than you. In fact, he met the issue head to head on the road to Damascus, when he was knocked to the ground and blinded by the brilliance of Christ’s glory, after which encounter becoming the greatest Christian missionary of all time.
You are just a “Johnny come lately” on this issue. You do not know more about it than Paul. He was a Jew too, you know, who lived two thousand years closer to the the truth about Jews, Gentiles, Christ, and salvation, than you.
The issue has never been stated more profoundly, in my opinion, than by Paul in his book of Romans. Why not consider Paul, a fellow Jew, and what he had to say about it?
I am no more - and no less - a Jew than any Jew who ever lived, lives or will live. My degree of religiosity and knowledge - well, that’s a different matter.
Do I know the future for sure? Nope. But neither do you. Maybe you’ll be like the high-ranking Vatican priest that my brother in Israel knows, who converted to Judaism because of what he found in the Vatican archives, and now lives as an extremely Orthodox Jew?
So, Saul of Tarsus converted - big deal. It doesn’t affect me at all. That said, if G-d wants me to do something for Him, then He knows how to locate me...but I have no illusions about my importance or influence beyond my family and immediate circle of friends and acquaintances. I’ll just keep doing what I’ve been doing, and as I suspect you will also do - which is to say, doing the best you can to live according to my/your morality, and hoping to influence others to emulate us by our example.