I do keep the feasts as best as I can. (No physical sacrifices needed today. Jesus became that sacrifice.)
Our church spends 8 days camping at our church property in tents, campers, RV's etc. The instruction regarding Tabernacles refers to temporary dwellings. My wife and I spent 1 year in a tent on our back patio. But the legalistic interpretation and application of how to celebrate those feasts isn't the important thing.
No physical sacrifice by the high priest once a year for the sin of the people.
Your correct, Jesus offers eternal forgiveness of sin through His perfect sacrifice (Genesis 22).
Yet, the offerings are still valid under the law. How many lambs do you offer
up to the Lord? Remember to build the altar first without tools (Exodus 20).
Numbers 28:9
Then on the Sabbath day two male lambs one year old without defect, and two-tenths
of an ephah of fine flour mixed with oil as a grain offering, and its drink offering.
Try and get it right.
1) Grain offering
2) Drink offering
3) Two lambs without defect
That's every Sabbath day.