God's person has One Spirit only called the Holy Spirit.
There are not literally seven spirits of God's Person.
This is to be understood as either 7 angels, or the seven aspects or eyes (Zec 3:9) of God's Spirit which symbolises God's perfect knowledge, foresight of future events, perfect wisdom, and perfection in all the events which are to take place revealed in Revelation.
The Ethiopic version reads in the singular number, "and this is the Spirit of God which is sent into all the earth"
One Spirit, with 7 attributes. "spirit of" , is in the sense, eg "spirit of wisdom" etc. It does not refer to the Spirit's person, who is and was and will only ever be One God, but to the Spirit's functions in 7 ways.