Aries: Either Distract them from the problem or leave them tf alone, play their favorite music make jokes just make them smile altogether
Taurus: Food, give them food, tell them that you love them and hug them and let them know they're safe secure and be a shoulder to lean on
Gemini: Be patient and hear what they have to say, don't say "things will get better." because they will just have an argument to prove you wrong, just listen to why they say life sucks and they'll get over it in no time
Cancer: Just let them know how wonderful they are and tell them you like it better when they smile
Leo: They may deny they're upset and tell you to go tf away, but just let them know they're loved and a big boost to their ego will help too
Virgo: they appreciate a helping hand but the best for a Virgo is just leave them alone to refresh, let them be alone but also say you love them
Libra: They just need encouragement in general
Scorpio: a Scorpio want's to feel validated but also if they ask for space, respect that.
Sagittarius: don't let them dwell on the issues boost their mood by making them happy dance with them sing with them do whatever obnoxious thing that'll make them happy to lift their spirits up
Capricorn: they'll try to keep busy to distract themselves but this will do no good help them to relax
Aquarius: Let them handle it themselves, let them know you care but still give them some space and their optimism will bounce back soon
Pisces: Not the easiest to reveal they're feeling but if they notice someone will genuinely care and it will make them feel better just let them talk