I'm nearer 60 than I am 50, but I do remember this 'turn'. Also a teacher for what it's worth - secondary.
I think when I was 49, both my kids left home within weeks of each other, and within 18 months I'd lost my beloved dog (he was 19) and two cats (also 19). I remember sitting on the sofa next to my husband and thinking 'Christ almighty, what do we do now?'
Where I am different is that I lost my dad in my 20s and my mum in my early 30s - although I'm close to my husband's parents (one of whom died fairly recently).
So we started with little stuff, and not consciously. We decided to subscribe to Hello Fresh (and I hate cooking) to try and few new things and take the strain off constantly thinking 'What's for dinner?' Literally added a little bit of spice to what had become a fairly mundane thing. We were used to hectic meal times with children and suddenly it was all terribly quiet. Created a bit of an ambience that we were cooking for each other and taking care of ourselves.
I stopped dying my hair completely and it went silver. I grew it. Got a nice cut - not what I had when I was younger - and people now comment all the time about my fantastic hair.
I've never been very pretty or shapely, but I was skinny, you know, and then got the 'middle age spread'. It took me quite a while to figure out what suited that new frame. I spent about 5 years fighting it, dieting, exercising when knackered, etc. Once I accepted it, that made me quite a bit happier.
In terms of diet, I changed that and upped my protein content by a lot. I also started taking regular good quality supplements as well as seeing a herbalist. This boosted my stamina and got rid of that listless feeling. Although, as you know, being a teacher means that sometimes you're just totally knackered.
I also worked out a decent daily beauty regime that has helped with my face. When I say 'I' worked it out, I mean Chatpgt worked it out.
I did try HRT. Wasn't great for me. Gave me catastrophically high blood pressure.
We also made other incremental changes, again, not really consciously. We redecorated our bedroom, got a luxe bed (super king with a telly in it), changed the sofa so it was more comfy, replaced our entire kitchen (that was a bit of a project), etc. This all sounds very dramatic, but it was over a period of about 5 years. We sort of went with 'Oh, that would be nice!' and saved up a bit. We did the kitchen ourselves over a summer holiday. It's not perfect. I like it though.
And then for reasons I still can't explain, I decided to learn to ride a 'big girls motorbike'. I had ridden when I was 18/19, but then children and practicality. Anyway, I learned, now I ride all the time. Something about it makes me feel free and solo. My husband also rides. Occasionally, we ride to places together. I think I just wanted to feel alive, and there's nothing quite like having 50 horsepower between your legs to remind you of that.