I agree with you @RosesAndDahlias . there is a big difference in being able to do some of these things interspersed with the mundanity of stress of every day essential chores whilst also caring for others, and having a year - or a considerable stretch of time - devoted entirely to this and to the self.
I suppose my intervention was because I sensed in your post @fizzythoughts and other PPs that you are quite frazzled and seeking a bit of serenity and calm.
I know the feeling, and when I get the feeling that everybody around me wants my flesh & blood, I realise I need to stop, and find a way to get some calmness within my current life situation, rather than a consolatory fantasy which is never going to happen.
There's a strong subtext of a kind of idealised self-improvement and purity of life in your OP as well, and I'm assuming it's in contrast to your everyday life. But I don't think it helps to think in that black & white way. You know the "If only I could lose 5 kilos and learn a language, I'd be happy" etc etc etc. Why not try to be happy anyway? Why put off doing what you can do, even if conditions aren't perfect?
We take ourselves with us, wherever we go. A year of solitude would be a year being you, as you are now. So why not use your fantasy list to see what you could do NOW, here & now, to find little bits of the serenity and self-improvement that you're fantasising about?
You're only going to get one life - why wish it away on something that will never happen? Of course, it's harder to actually DO stuff, rather than fantasise that if you could just go there (away somewhere) everything else would happen.
And believe me, as someone who does spend a lot of time in solitude - writing, living through 2 years of lockdown completely on my own - solitude is not the magic pill. Nor is going to some other location. We always take ourselves with us.
It just makes me a bit sad that so many of you are wishing away your lives with unachievable fantasy, when you could actually DO a lot of the things you're fantasising about! Why not go for it? It's amazing what you can do, bit by bit.