We read in 2 Timothy 3:16-17”All scripture, inspired of God, is profitable to teach, to reprove, to correct, to instruct in justice, that the man of God may be perfect, furnished to every good work."
There are some considerations that undermine the Sola Scriptura interpretation of this passage.
1st- I think sometimes the appeal takes the form of an emotive appeal to the fact that the text says all Scripture is inspired by God — better translated as “God-breathed” — as if Catholics did not also believe that Scripture is written by the verbal inspiration of God. Ultimately, however, the appeal to the first clause is fruitless since it merely says that Scripture is profitable or useful (not sufficient) (Greek, ophelimos) for teaching, not that it is mandatory for teaching every individual point of theology. (It is useful for the Christian in coming to know, love and serve God, but it is not an all-inclusive handbook on how to be a Christian or govern the Church.) A hammer is profitable or useful for driving nails, but that does not mean that nails can be driven only by hammers. Likewise, Scripture is useful in the life of the believer, but it was never meant to be the only source of Christian teaching, the only thing needed for believers. So “Ophelimos” only means useful, which underscores that Scripture is not mandatory or exclusive.
2nd – “All” in the Greek is PASA, and it actually means “Every”. In the Bible, when Scripture is used in the singular it refers to an individual passage or book, not the whole Bible. So this means every passage of Scripture is useful. Thus, the erroneous Protestant reading of “pasa graphe” would mean every single passage of Scripture is exclusive. This would also mean Christians could not only use “sola Matthew,” or “sola Mark,” but could rely on one single verse from a Gospel as the exclusive authority of God’s word. This, of course, is not true and even you would agree. Also, “pasa graphe” cannot mean “all of Scripture” because there was no New Testament canon to which Paul could have been referring, unless you argue that the New Testament is not being included by Paul.
Mark off 2 Timothy 3:16-17 off your list of verses to "prove sola scripture".