If I care strongly about an issue, but I also know it's likely to win, isn't the best tactic for me to not vote for it to save my credits for more marginal issu

If I care strongly about an issue, but I also know it's likely to win, isn't the best tactic for me to not vote for it to save my credits for more marginal issues? If everyone votes tacitcally, it seems like a lot of votes would be won with slim majorities. But that risks random upsets, even on issues which everyone basically agrees on!