Is it "more often" or "once more" "(once) again?
None. It says the person would like to go to the sea more (times).
Then it should say "more often".
@NNC
FYI: I took this sentence from Duolingo, so it is probably natively acceptable.
As a native, I can tell you that "I would like to go to the sea more" is a perfectly acceptable version of "I would like to go to the sea more often". However, we should not be taking sentences from Duolingo.
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