@Gryffindora I actually really like the Superdrug version of Pixi Glow Tonic; it is their own brand and is called Glycolic Tonic, it's very effective and didn't break me out - a lot of Superdrug products seems really good on paper but then end up breaking me out, this one is a definite exception.
I use more than one active but only one active at a time :) I believe over exfoliation has become a lot more common due to trends like the Asian Beauty routines where basically every active product you might want is used every evening. I prefer to use, for example, lactic acid twice a week, BHA once a week and would use retinol once a week. You can switch this up depending on what works for you, and even move some products (sunlight friendly ones like Niacinamide and BHA) to the AM so you aren't overloading your skin. So if you wanted to use retinol but also acids, instead of using them together you might want to use your retinol twice a week and then on other days use your acids 2 - 3 times a week.
That's only for active ingredients that are going to be beneficial but also are at risk of being overused, like acid and retinoids. You can use all of your moisturising products however much you like!
There is a lot of hype around the ordinary as they have made scientifically proven ingredients genuinely affordable, but their formulations can be hit and miss. The acids are good though I think. If you have the budget I would also recommend Paula's Choice. When it comes to moisturisers layers work better but I've found incredibly simple combinations like those French spray waters (I use Avene as it has a low mineral content) followed up by Aquaphor or even just Vaseline. Plant oils are also lovely and have more benefits than mineral oil based products, so you can either replace these as your last (occlusive) layer or layer them before your heaviest moisturiser.
Sorry I went off on a massive tangent! But yeah, I certainly prefer to have a mix of active nights and just restorative moisturising nights, but honestly my skin is really sensitive. I do really believe that less is more though and there is no evidence to support overloading you skin with active ingredients. Sites like Paula's choice have articles about how it's fine to do this but I don't think it's wise or necessary and just encourages people to buy more products and use them more often.