A grand fantasy by Czerny based on themes from Rossini's William Tell, intended for the salon or concert stage. It relies heavily on 19th-century bravura techniques to recreate the excitement of the opera overture.
You must balance the brilliant technical displays with careful voicing of the operatic themes throughout the dense piano textures.
Comparable difficulty and character — good candidates for what to learn next.
2 Grandes fantaisies sur les motifs de 'Guillaume Tell' (Op.221) is rated Henle level 7 of 9 — late advanced repertoire, roughly ABRSM grade 8 and above.
You should be comfortable at Henle level 7 — meaning you can already play level 6–7 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 2 Grandes fantaisies sur les motifs de 'Guillaume Tell' (Op.221) lasts about 10 minutes.
2 Grandes fantaisies sur les motifs de 'Guillaume Tell' (Op.221) 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 'Fantasie Brillante sur des motifs d'opéra ‘Le nozze di Figaro’ by Carl Czerny, Capriccio à la fuga by Carl Czerny, 2 Grandes fantaisies sur des motifs favoris de 'Norma' by Carl Czerny — see the full similar-pieces list on this page.