See the Holy Word of Elohim:All who seek salvation in YHvH are called saints.
shalom b'SHEM Yah'shua HaMashiach
Ps. 16:3; 34:9; Dan. 7:18, 21, 25, 27; Matt. 27:52; Acts 9:13, 32,
41; 26:10; Rom. 1:7; 8:27; 12:13; 15:25f, 31; 16:2, 15; 1 Co. 1:2; 6:1f;
14:33; 16:1, 15; 2 Co. 1:1; 8:4; 9:1, 12; 13:13; Eph. 1:1, 15, 18; 2:19; 3:8,
18; 4:12; 5:3; 6:18; Phil. 1:1; 4:22; Col. 1:2, 4, 12, 26; 1 Thess. 3:13; 2
Thess. 1:10; Phlm. 1:5, 7; Heb. 6:10; 13:24; Jude 1:3; Rev. 5:8; 8:3f; 11:18;
13:7, 10; 14:12; 16:6; 17:6; 18:20, 24; 19:8; 20:9
In Christian tradition though, the word came to mean those properly canonized by the Church.
You’re right, New Testament use of “saints” is in reference to all Christians.
Some have tried to change the meaning since then. I prefer to use the term in the sense the Bible does.