I've read somewhere in the forum that a suggested way for progressing with Bach is...
1. Notebook for ana magdalena bach
2. Two-part inventions
3. Three-part inventions (sinfonias)
4. French Suites
5. English Suites
6. Partitas
7. Well-Tempered Clavier
8. Goldberg Variations
...or something like that... Note that movements from the suites and partitas vary greatly... For example the prelude from partita 1 is Grade 8 (ABRSM) and Menuets I & II are Grade 5 (ABRSM)... Just pick the movements you like and within your capabilities. In my opinion, you could play the short/little preludes when you have already started with the two-voiced inventions.

good luck.
EDIT: If you like Bach, you might also like Scarlatti's sonatas, many of which are in the intermediate level, also Baroque. They are ranked by difficulty in this thread:
https://www.pianostreet.com/smf/index.php?topic=19512.0