N3 — outside your level filter

furthermore; on top of that — the next step in the same direction

一次いちじ審査しんさでは書類しょるいを確認かくにんします。さらに、二次にじ審査しんさで面接めんせつを行おこないます。

ichiji shinsa de wa shorui o kakunin shimasu. sarani, niji shinsa de mensetsu o okonaimasu.

The first round is a document check. Beyond that, there is an interview in the second round. neutral

台風たいふうで電車でんしゃが止とまった。さらに、幹線道路かんせんどうろまで通行止つうこうどめになった。

taifuu de densha ga tomatta. sarani, kansen douro made tsuukoudome ni natta.

The trains stopped because of the typhoon. On top of that, even the main roads were closed. neutral

Variants

更にsaranialternant
the kanji spelling, common in print and official documents; kana is the ordinary choice elsewhere and neither changes the meaning.
さらにはsaranihaliterary
adds は when the addition is a bigger jump than the last one — さらには、制度せいどそのものを見直みなおすべきだという声こえも出でている; speeches and written argument, rarely conversation.

さらに

さらにsaraniN3formal