The biblical concept of “holiness” is not simply “doing good”, but it is the context that defines what is good and infuses our doing good with divine significance. The relationship between holiness and what the world sees as “good” is complex: sometimes they coincide, sometimes they are askew, and sometimes they come directly into conflict.
God’s unconditional love does not imply that what we do doesn’t matter. Nor does believing that what we do matters imply that God’s love is conditional. The biblical truth is that God loves us unconditionally, and that is precisely why what we do matters.