For The Galuna island arc, it was related to Gray’s past, and Natsu somehow saved him from death twice and guided fairy tail to victory and did like 70% of the fights of this arc
And the next Arc, against Gajeel’s previous guild, it was to related to Lucy, and again Natsu saved her two times and did like 60% of the fights of this arc and even stopped the canon and guild to victory again
For the next Arc, the Heaven Tower, it was related to Erza and again natsu did like 80% of the job and even saved from death twice
the Oracion seis arc I think was kinda related to wendy somehow ? I don’t know but again natsu did like everything again (fought all members of the guild except angel and even beat zero)
don’t forget the arc where Laxus wanted to take over fairy tail, natsu was the only one to stand against him and stopped him (with the little help of gajeel)
Tenjourima arc was a full-out fight against them, he beat the shit out of hades (somehow related to Makarov?) anyway he did like everything and guided them to victory
So we see that natsu resolved Gray, Lucy, Erza, Wendy , Laxus and Makarov’s problems, and now that we arrived at this arc that’s related to Natsu “Zeref and him being END” I do think they’ll do something for him anyway let’s just wait