Hi Op
Sorry about your loss 


Have you got good friends/family members you can turn to?
You could take in turns with a friend/family members to babysit for each other,
Or you could do a favour for e.g offer a wisdom of a useful skill in return for having your children babysat or pay them.
Is Gingerbread single parent support group still going?or any other support groups/tel help lines online?
Do you have spare time in day or night time from your children to have a break on a regular basis?
if not,
Make sure you set robust strong boundaries to have spare time for yourself essential for your Sanity Op..
With your spare time check YouTube/online Facebook
to learn a new skills/interests you are curious about or you used to?
Benefits to you are :
It be fun,get your mojo back.!
And get your self identity back,not just a mother you are much more than that too,
It improve self cofindence..
Also listen to good music you like on youtube /online make you feel better.
Watch feel good movies that you enjoy.
Watch funny films/stand up comedians
Have a go,experiment at doing creative Art activities.
does not matter if you are talented at this or not,
Have a go at doing meditation its good for stress, well known for clarity for mind.
Also on a regular basis go for a walk in nature on your own or with your children.
Do star gazing often..
Have a healthspa pamper session at home for yourself.
Also when lockdown eases up
Find out about Holistic Therapies/healthspa pamper session ,such as hot stone massage etc.
Learn a new skill such as learning a new languages etc
To do a course/workshop online
Also look into feng shui books from libarery etc, helps to improve your personal envoriment,so it works better for you.