Hello,A break of 10 years is what happened to me. I am by no means an expert but this is what I learned so hopefully it is useful to you:1) To start of again you might try the etudes by Clara Wieck. It is a bit of everything. A few a day keeps the variation.2) Scarlatti sonata's especially slow practice will bring you real progress. Pick sonata's that also have runs in the left hand. Czerny is repetitive and mostly for the right hand. If any Op. 740.3) You can improve your mechanics on a digital (for example trill) but is important to play regularly on a good acoustic piano.4) Read the posts by Bernhard on how to practice effectively.5) It is not required to start with easy pieces. Just start with the level or one below that you stopped with.6) Once in a while, study a piece that you studied when you were young. It will sound better and progress will be much faster. Apply what you discovered in the Scarlatti's.7) focus on relaxation. In the beginning you might tend to cramp up. focus on the basics ... Listen to yourself. that is much easier when you are older.Hope it helps. Let us know!Regards,Gert
Hello I am sorry I meant Wieck studies (Who is the father of Clara Schumann)https://hz.imslp.info/files/imglnks/usimg/c/cc/IMSLP10128-Wieck,_Frederic_Piano_Studies.pdf