I started writing a self-care post awhile back but a lot of it is rendered obsolete. I want to say up front that I am not a doctor, and any mood depression for more than a day, while understandable, probably needs to be acted on ASAP in these times. Seek professional help where possible. This post is self-care for people who are in a good frame of mind, to keep them there.

It is a fact that smell is one of the senses that brings a sense of wellbeing (it's not a fact, I just made that up but it sounds right so let's go with it). Now is the time, if you can afford it, to spend extra bucks on the shower gel, conditioner and laundry detergent you like. The ones that remind you of a holiday, the one that make you feel pampered, the one that makes you smile when you sniff the dry towel as you take it off the line. These are small moments but they happen throughout the day so you'll get an instant hit of happiness.
Now is also probably the time to invest in fancy soap given you'll wash your hands more times a day than when you had a new born. Also nice smelling hand cream. I managed to get a lavender hand sanitiser and compared to the others, it feels like a luxury (because the smell envelopes me in a sense of wellbeing).

Go through the cupboard and dig out any fancy lotions you were given that never got round to using, or start going through all the hotel bottles you pilfered over the years. The memory trigger of where you got them might be enough to start your day with a smile.
Carve out some time for you. It can be first thing in the morning to write, before everyone gets up. Or a lunch break in the middle of the day where you listen to a lecture. I signed up to a University short course on literature, and you listen and answer questions in a group chat. It's an hour but I felt so elated after the first one. Intellectually engaged, talking about something other than the virus or the impacts. There are plenty of free courses and talks so make use of those.
Work on making yourself feel good. Exercise and healthy eating are a must, as they help your physiology (again, not a doctor & this alone won't cure depression but it will help maintain happy mood levels). May not have used the word physiology correctly.

If you are finding concentrating too hard to read, try audio books when you cook. The escape into another world is a welcome break, and the focus of your thoughts actually works to relieve stress, just like meditation would. It shuts out the noise in your head, which I suspect some days will get loud and heavy for us as time passes.
I am playing music in the shower on my phone (still a navy shower - we can't forget the drought, people!) and I am doing 30 mins of exercise daily with YouTube to music. If there's an exercise I think will hurt my back, I just dance through it. I do it before my shower each morning and the energy burst and happiness of the music is really starting my day right.
Organise Zoom catch ups with groups of friends. It gives you something to look forward to at the end of the day and helps you feel less isolated. Look also at what's on. There's now trivia nights you can sign up to, streamed stand up and a myriad of other things. If you can't go out, still find a way to enjoy what you used to enjoy. Or find something new...
You can't fix the big picture, but little by little you can make it easier and more enjoyable.
Linking with
#FriendshipFriday
As stated, now is the time to act quickly if mood is slipping. Don't waste time struggling. Now is not the time to muck around. If you can't afford to talk to a psyche, call a friend or here are some numbers:
Kids Helpline (for anyone under 25) 1800 55 1800 - there's also a webchat.
Beyond Blue 1300 22 4636
Black Dog Institute has Covid19 specific resources on their website
https://www.blackdoginstitute.org.au/
I would recommend talking to your GP ASAP regardless. Most GPs are now doing phone consults for non physical ailments.