Josephine my sight reading is super bad so I can't just get some sheet music and play some easy pieces, and the pieces I pick are so difficult that I'm always practicing and never really playing. And I got bored with practicing.
Josephine, I understand that your sight reading is super bad. You have been flying through the first stages of learning to play the piano. I have been shocked and stunned when I read which pieces you planned to learn even though you had not played for a long time. So compared to other piano students who learn those pieces, you have gained much less experience with all kinds of other pieces that those other students have practised.
I am a slow piano learner. In the beginning this was hard for me to accept, because I was used to be a quick learner in other subjects. But once I had accepted that, a lot of frustration disappeared. I have also adjusted my goals to being a slow learner. Instead of aiming for difficult pieces that will take me forever to learn, I play pieces that are well within my reach, and I focus on technique, playing them as best as I can. This means a very slow "progress" to more difficult pieces, but my gratification comes from playing well.
So I think you need to find out what works for you, for your temperament, for your talent, for your motivation. One level down from the latest pieces that you have picked? Practise short pieces? Practise only the most appealing section(s) of a piece, and then move on? Find a sight reading course and learn to sight read? Two tracks simultaneously, one with sections of difficult pieces, that you only practise as long as you feel like it, and the other track with easier (but appealing) pieces that you practise and polish?
Just some thoughts!