Understanding the covenants, understanding what is eternal about them from God is NOT making a mishmash as you are incorrectly accusing, . It is reading scripture with the help of the Holy Spirit instead of reading it as only a person of the flesh.
The holy spirit tells us many things about the Lord, it tells us the Lord is Holy, the Lord is truth, the Lord is love. If you don't accept the Lord as He truly is as you read, then you say the Lord makes mistakes, the Lord does not help us, the Lord had to cancel all His promises of the old covenant. That is fleshly reading, not reading with the holy spirit. The Lord tells us He made a better covenant and now the old one is obsolete. Listen to the Lord. The Lord did NOT tell us every promise he made before the new covenant is cancelled and the Lord will never honor them again.
Blik you have a very confused hermeneutical of the OT. From everything you have said, it seems to me that you believe that because the Old Covenant came first, it is therefore first in importance.
But the New Covenant is not dependent on works, keeping the law or obeying God. Of course, we we do try to do good works as Paul says in Eph. 2:8-10. But works cannot save us. Obeying God cannot save us, although we should always be reaching out to obey God. And we certainly do not have to keep any of the 613 OT laws, for all the people, or just the Levites and priests.
The Old Covenant has to be read through the eyes of the New Covenant. That means the OT has to be read with a firm foundation of faith in Christ, because he delivered us from sin and death, which fulfills not just the law, but all the OT prophecies.
You have it all wrong!! You lay a foundation in the law, and second comes Jesus. I believe your faith in Christ is enough! God always gives us the right amount of faith. But then you have added all this confusing mess of the OT, confusing everyone, including yourself.
At no point does the Bible urge NT believers to go back to the law. The Old Covenant has been washed away. I plead you to study the NT, and when you read the OT, to do it through the eyes of a born again believer, who puts Christ first, and interprets the OT in light of Jesus, and how he broke the power of sin and death.
One of the things that drew me to Christ was realizing that I could not keep the law, and I was a sinner going to hell. I was fortunate, in that so many people reached out and told me the gospel, their testimonies were many, but no one said I had to obey the law. We do have to repent. But boiling a goat in his mother's milk, or wearing a blend of cloth, or not sacrificing a lamb or a bird means I am going to be tempted with, or will send me to hell. Jesus set me free from my former wicked and sinful self. The Holy Spirit made me a new creature in Christ. I praise him for that.
No law or following it saved me. You are espousing a heresy. You have changed the gospel from
1 Corinthians 15, to one of your own making.
Plus, I hope you have noticed that not one person in this forum who know their Bible agree with you. I've read the OT from cover to cover over 50 times. God shows me something new every time I read it. The last couple of years, God has shown me Jesus in the OT. I guess I am looking for him more, too! I'm sure you have also read the OT many times. But you have not been listening and you are not hearing from the Holy Spirit, but some enemy leading you astray.
I'm praying for you to find your way back to the real gospel. And please take care of yourself during COVID.