Caecilia by Otto Braune is a minor-key character piece that utilizes romantic harmonic progressions and expressive melodies. It is typical of parlor music from the late 19th century intended for home performance.
Work on achieving a warm, sustained sound through careful use of the sustain pedal.
Comparable difficulty and character — good candidates for what to learn next.
Caecilia is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 5.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Caecilia lasts about 4 minutes.
Caecilia is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Pavane pour une infante défunte by Maurice Ravel, Waltz in C-sharp minor, No. 2 by Frédéric Chopin, Waltz in A minor by Frédéric Chopin — see the full similar-pieces list on this page.