maybe try some lime to lower acid level,cut a few low branches,and constantly clean up the needles,and then miloganite, if they have it around you,im sure they do,miloganite is dirt cheap but incredible,i hand dug in a couple zones at my house, i put a bunch of miloganite on it,more than i had anywhere else before, and in like 9 days,the
6'' wide by 100' area,was 10 inches high perfectly green and it looked crazy, the whole lawn was brownigh and then there was this 100' of this zone pattern basically of tall green grass, pines are horrible for grass, but there is a slight chance it may help a few blades of grass and blend a little better.
all that and the grass may still not even grow, you could try some shade tolerant grass seed is lime and milganite do not work,or turn it into a mulch bed haha.
Will try to find miloganite in my place,maybe they have it here but in different name,you know french haha,from what i know,it is more like an organic fertilizer right?will give it a try if i find one,btw i tried to kill that moss like thing with moss killer but it did'nt do anything so i suppose it is'nt a moss,will try to rake it gently again and see if i can get rid them out,even if i put fertilizer on it,those mose will just suck them so i was wondering if digging some small holes will get it done?