What didn't help the show was them not really having a plot.
"Lost ship going home" just isn't sustainable for more than 2 seasons. It's too nebulous to really drive the show, and TBH it's just them taking what already happened to Kirk and Picard and trying to stretch out a one episode plot into an entire series.
Plus, it's "Gilligan Syndrome". You KNOW all their attempts to go home before the finale will fail, otherwise the show would be over because they never gave them any other plots.
What the show would've benefited from was having plots that could drive the series and be accomplished WITHOUT ending the show.