Maggie, you have posted a few times, and I am glad that Gransnetters are helping you towards your decision.
We are a couple, whose basic outgoings are under £1000 a month, which includes some treats. Our house is easy to maintain and extremely well insulated, which helps, and you may like to look at that.
Although the cost of being at home is higher because of energy bills, you do find that you can live more cheaply as you have time to look for bargains, make things from scratch, repair etc. In normal times we have plenty of free and cheap things to do.
Do you know Martin Lewis' MSE site? It is wonderful for pointing out how to save money and get good deals. He has a great checklist for keeping expenditure down.
Without doubt, poverty is stressful, but as others have said, £900 a month is not poverty unless your bills are high.
You have savings for anything unexpected.
You don't say if you have a car, or need to run one, and that is, I think a major expenditure. You're not yet eligible for a bus pass, so you do need to look at that carefully, but you may need to run it a lot less than at present.
I do hope that this works out for you, I know quite a few people who have done something similar and are very glad to have done so.