It’s very valid to not always be up for it. I appreciate when people like my posts/comments but I understand that most people won’t, and I go through waves too. I tend to spread the happiness when I’m doing well, but if I’m not doing well I only have it in me to scroll. I can’t explain why spending the time to upvote feels like work when things are hard, but it does. I don’t think there’s anything wrong with not upvoting, but it is nice to do when you are able.