If you're still around OP, I found your thread when googling to see if there was a reason why I can't get cottage cheese at the moment (I sometimes eat a pot of Longley Farm, the best kind that I've eaten for years) for breakfast.
Predictably it's the latest TikTok craze so I might have a go at making my own as I bought a cheese making kit from Amazon a couple of years ago and I'm on a bit of a 'use up' mission at the moment. It it was only £8 and it's well worth the money, you get a thermometer, rennet, citric acid, cheesecloth, mould and himalayan salt.
I haven't made cottage cheese yet, but have made a soft ricotta style cheese and mozarella and I was all set to use the quantities in the instructions specified, ie a gallon or two large bottles of milk but I'd poured one into my biggest pan and it was nearly full, so I did a half batch and it still made quite a lot of ricotta (but it also took ages and wasn't as nice as the cheap stuff you get in Aldi so I won't bother with that again).
The mozzarella made about what you get in two standard supermarket balls from 4 pints of milk and that was much quicker and pretty good, so I'd do that again.
I'm now going to have a go at making cottage cheese seeing as I can't seem to buy it right now and hopefully it will be as creamy as Longley Farm.
I recently heard in a podcast about protein products that there's quite a lot of protein in the whey (as it's a byproduct of the cheese making industry that's used to make whey powder on an industrial scale) and they said that it can be used in smoothies and recovery drinks.