Saying “it could be worse” can invalidate emotions and circumstances. It not that you want to try to always be positive. But “things can only get better” isn’t superior. That’s unrealistic and possibly harmful, too.
But if you say one, remember the other is just as valid. It’s a tempering move, something to brace against while you tackle to tough, real world with your soft feelings and ideas. Feel your feelings and keep moving along, move forward, move even though you’re afraid. Make stuff and make the next stuff better than this stuff. Sometimes that’s enough.