I doubt you need to worry about protein. Unless you eat an insane amount of very protein rich food.
Opinions differ a bit about protein. I can’t get satiated without lots of protein so I eat as much (usually quite fatty) protein as I need. I can’t eat adequate protein on most days, I eat more, sometimes way more but it’s fine until it’s not crazy high. It doesn’t get me out of ketosis, it doesn’t harm me… I don’t eat unnecessarily much just a bit high.
If you obsess over thing regarding eating, it’s best not to worry about it if you can do it. That harms, a bit more protein isn’t unless you have some illness and can’t eat a bit too much protein without problems but you would have told so if it was the case.
There isn’t even a good number for protein per meal. I don’t know your protein need but I easily go over 100g protein in a meal sometimes (I’m a short woman with not much activity so it’s a bit more than adequate for a day) as I often eat once a day (and even if I twice, my first meal is bigger, often way bigger). Many eat way more protein than me, even in one sitting but many people do need much more I do.
(I would worry about my protein at 500 kcals a day for sure, that is hardly enough for the minimum amount of protein and fat and if it’s enough for a small, inactive one (fat and protein), it’s still starving and hard to get the other necessary nutrients. I guess it was short term but still, that is way too little.)