Telemann's sonatas for solo violin with harpsichord accompaniment are masterpieces of the Baroque era, demonstrating his prolific output and tuneful invention. They feature delightful dialogue between the instruments.
Focus on expressive melody and creating a well-balanced dialogue between violin and harpsichord.
6 Sonates à violon seul accompagné par le clavessin is rated Henle level 5 of 9 — late intermediate repertoire, roughly ABRSM grades 6–7.
You should be comfortable at Henle level 5 — meaning you can already play level 4–5 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
6 Sonates à violon seul accompagné par le clavessin is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.