Welcome L-M
Motivation... For me, motivation was never an issue until now. I enjoy practising. Maybe not every single time I practise, but basically. I push on keys, and out comes music. It is a miracle!
But motivation has become an issue since I have become very much occupied with other issues. For years, my signature has been "... feeling like the pianist on the Titanic ..." and it seems as if the ship hit the iceberg some time ago and more and more water starts to pour in. The piano is still fine, music is still music, I can still sit and play, but how much longer?
I'm sorry, I realise that this is not much of an answer to you.
Here is my answer to you: enjoy your practising. Deliberately enjoy the process. And motivation comes naturally.