Hi OP,
Firstly, you are not failing at all. It sounds like you are in a really difficult situation. And although this is survival mode, your 6 year old will not stop learning just because there is no school.
Do you have family?
I have been getting my mum to listen to my daughter read, read books with her and play games via WhatsApp. A lot of the time, kids just want someone to show what they have done to.
There is an amazing project called the Granny Cloud run by Sugata Mitra where they do just that. If you have 5 minutes to google it, his studies have shown how much children can learn by themselves with just some encouragement from an online "granny"
We have also been setting up playdates online with other children. My 6 year old spent an hour playing Playmobile with her friend on Skype last night and DS does the school work he is set with his friend from the same class online so they can talk about it and collaborate.
We think of education as the deliberate transference of information from adults to children, but children are learning all the time. Your 6 year old learned to speak fluent English with no formal lessons at all.
Use technology to support you. There are loads of free apps to help with learning.
But even if you do none of that, you are still not failing!