Sola scriptura (Latin ablative, "by scripture alone") is the doctrine that the Bible contains all knowledge necessary for salvation and holiness. Consequently, sola scriptura demands only those doctrines are to be admitted or confessed that are found directly within or indirectly by using valid logical deduction or valid deductive reasoning from scripture. However, sola scriptura is not a denial of other authorities governing Christian life and devotion. Rather, it simply demands that all other authorities are subordinate to, and are to be corrected by, the written word of God. (https://en.wikipedia.org/wiki/Sola_scriptura)
I might suggest that what you have indicated as your understanding is more Solo Scriptura which doesnt work well at all.
And who defines what is "valid"?
There is the problem. You admit that your own deductions are "valid" yet deny that to others.