If you're weaker on the LH, because most beginner pieces focus more on the RH, pick up one of the books from Wunderkeys. The music seems to have a lot more LH stuff, and it's more complex, than what the other method books have.
As an example, this is from Wunderkeys book The Cinderella Solos which is early intermediate/late beginner. Watch my LH and you'll see that it switches off with the RH and carries the melody sometimes before changing to harmony again.
https://rumble.com/v4wui8c-practice-is-hard-sometimes.html
Most of the Wunderkeys stuff does this. The Intermediate Performance, level 2, book I have continues with incorporating the LH more than just basic chords but it's also more advanced, easily mid level intermediate and above.