Albert L. Fink’s 'Bolivar' is an obscure salon piece that utilizes the rhythmic profile of the bolero to convey a stylized, exotic character. It is typical of the minor works produced for the American or European music publishing markets of the late 19th century.
The primary task is to maintain the distinct, driving rhythmic impulse throughout the piece.
Comparable difficulty and character — good candidates for what to learn next.
Bolivar 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 Bolivar lasts about 4 minutes.
Bolivar 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 Piano Sonata No. 16 in C major by Wolfgang Amadeus Mozart, 12 Variations on "Ah vous dirais-je, Maman" by Wolfgang Amadeus Mozart, Maple Leaf Rag by Scott Joplin — see the full similar-pieces list on this page.