この次は君はもっとうまく歌えるでしょう。

You will able to sing better next time.

この次(つぎ)は君(きみ)はもっとうまく歌(うた)えるでしょう。

Kono tsugi wa kimi wa motto umaku utaeru deshō.

此の (この)

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

次 (つぎ)

next; following; subsequent; stage; station

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

君 (きみ)

you; buddy; pal; monarch; ruler; sovereign; (one's) master

もっと (もっと)

(some) more; even more; longer; further

上手い (うまい)

skillful; skilful; clever; expert; wise; successful; delicious; appetizing; appetising; tasty; fortunate; splendid; promising

デス (デス)

death

Readings: ジ、シ、つ.ぐ、つぎ

Meanings: next, order, sequence

Readings: クン、きみ、 -ぎみ

Meanings: mister, you, ruler, male name suffix

Readings: カ、うた、うた.う

Meanings: song, sing