I think if anything you are going to fall down with your seeming inability/refusal to consider any potential negatives or risks of your current housing/social/family situation.
It’s really great news that you feel so much calmer and more chilled out, but you still need to demonstrate healthy sceptiscism about some of the people you have in your life - namely - your mum. It’s a start that she’s not drinking around your or your son, but is she still drinking? Is your mum alcohol dependent? Because if she is then we all know it’s just not possible for her to go a day without a drink, so inevitably she will be in yours and your sons presence when she is intoxicated, even if she’s not currently lifting the glass to her mouth within your eye line. You are going to have to demonstrate to social services that you are able to truly see your mum and the risk she presents to you and your children and that you can take appropriate steps to safeguard yourself and your children from the risk of emotional harm presented by her condition.
You (and any siblings) were all on a CPP because of your Mum and her alcoholism and other factors shooting off from that. You can’t turn back up to social services and say “hey, we’re living with this woman who failed to adequately prioritise, protect and parent us, but don’t worry it’s all fine now and I feel super calm because I don’t have to actually see her drinking now, okay bye”.
You are not the child now, you’re not the person who needs safeguarding, you’re the mother in this situation now and the safety and wellbeing of your children is entirely within your power, but you will need to take a very long hard look at everyone around you, and consider what level of contact and involvement is appropriate for some of the people who are important to you. You need to step outside of the victim/child mentality and take control of your life for the ultimate wellbeing of your children. You need to make your own decisions, boundaries and a plan for your family unit to become independent from your family of origin as soon as you can.