Neglecting To Contact, Long Silence
noun, verbal noun
If you select to talk to nothing but sand for a really long time, you're neglecting to contact anyone else. Your relatives miss you! Stop talking to sand and call them!
ごぶさた
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
ご無沙汰しております。
I haven’t seen you in so long.