Finished Brahms Pno Trio 1, What Solo Piece to Play Next?[please read]

[pnovln4life]

I have spent 2 1/2 mos learning the 1st mvt of his first trio in B Major for my HS pno trio [ memorized  ] , which I have to say was a huge feat for me. I was wondering what solo repetoire would be equivalent in difficulty to this piece?

Here is a link to the score for reference: https://conquest.imslp.info/files/imglnks/usimg/d/d7/IMSLP138486-PMLP52223-JBRahms_Piano_Trio_No.1__Op.8_rsl.pdf
(first 22 pages)

Thanks in advance!