Hebrews 8:13 "In that he saith, a new covenant, he hath made the first old. Now that which decayeth and waxed old is ready to vanish away"
Ever just wanted a nice cold glass of milk, or just a little bit for your coffee, and quickly found out it was…out of date. Just one sip or whiff and there was no denying it was sour. And it looked perfectly fine!
In Hebrews 8:13 it says that the old covenant is old and out of date. It had served its purpose. It was time for a new covenant. Romans 10:4 says "Christ is the end of the law for righteousness to everyone that believes". The purpose of the law is to show unbelievers that it's impossible for anyone to be made right with God by keeping the law. To show us that we need a Savior, and to bring us to Christ.
Like old milk, the law has a sour taste to a believer in Christ. It's "waxed old", which is old English for obsolete, useless, aged. So, it's time to get rid of the old and bring in the new. You have a better covenant based upon better promises. Earlier in Hebrews 8, God says "I will" five times. He's declaring His part. So, I asked God "what's my part?", to which He reminded me, only believe. Believe His promises and let Him do the rest!