辿り着く means to finally reach a destination, often after struggle, wandering, or overcoming obstacles. The character 辿 suggests following a difficult path, giving the word a poetic sense of perseverance.
In the song, the narrator sings about believing in the radiance they will 辿り着く to despite facing headwinds. It vividly captures the determination to keep moving toward a hard-won goal.
"Destination" by Janne Da Arc is a song about running flat out toward something you can't even see yet. It opens in a trap: "時の迷路は容赦なく" [the maze of time shows no mercy] keeps leading a lost child further astray. The scenery is all wreckage, "砕けたガラス 錆びた空" [shattered glass, a rusted sky], but look closer and there's "瓦礫に咲いている花" [a flower blooming in the rubble]. That one flower is the whole song's mood in miniature.
Then the chorus kicks the door in. "加速し続け 高鳴る胸" [I keep accelerating, my heart pounding] and "壊れてもイイ 視界は闇" [it's fine if I break, my view is pure darkness]. Note the katakana イイ in place of the usual いい: it's the same word for "good" or "fine", just written with more attitude. He's half blind, heading into a "向かい風" [headwind], and still begs "もう誰も止めないで" [nobody stop me anymore]. The second verse is darker. Dreamers end up "生きゆくために夢を削り" [whittling down their dreams just to stay alive], and the city is cold and lifeless. The last thing before the chorus returns is a question he can't answer: "何のため?誰のため?" [for what? for whom?]. I like that the song never answers it. It just floors the accelerator again.