en_tn_lite_do_not_use/job/23/02.md

Even today my complaint is bitter

Here "Even today" emphasizes that his friends arguments have not changed Job's situation at all. Alternate translation: "In spite of what you have said, my complaint is still bitter"

my complaint is bitter

Job speaks of his unanswered complaint against God as if it was a bitter taste in his mouth. Alternate translation: "my unanswered complaint is as bad as bitter food in my mouth" (See: rc://en/ta/man/jit/figs-idiom)

my hand ... heavy because of my groaning

Possible meanings are 1) "I can barely lift my hand because of my groaning" or 2) "God's hand continues to make me suffer in spite of my groaning" where "hand" refers to God's power to punish. (See: rc://en/ta/man/jit/figs-metonymy)