There are more than seven.
The Phinehas Covenant or Priestly Covenant (Numbers 25):
7 When Phinehas son of Eleazar, the son of Aaron, the priest, saw this, he left the assembly, took a spear in his hand 8 and followed the Israelite into the tent. He drove the spear through both of them-through the Israelite and into the woman’s body. Then the plague against the Israelites was stopped; 9 but those who died in the plague numbered 24,000.
10 The LORD said to Moses, 11 “Phinehas son of Eleazar, the son of Aaron, the priest, has turned my anger away from the Israelites; for he was as zealous as I am for my honor among them, so that in my zeal I did not put an end to them. 12 Therefore tell him I am making my covenant of peace with him. 13 He and his descendants will have a covenant of a lasting priesthood, because he was zealous for the honor of his God and made atonement for the Israelites.” (Num.25:7-10).
There are more than seven covenants in the Old Testament, yes. But there aren’t more that speak to our Salvation and carry the promise of our redeemer right down to Christ. This “covenant of peace” isn’t part of the redemption promise.