is all that I know (is the only thing that I know) <-- this one really stumped me, stupid pronouns!
solum est quod cognosco
solam est quam cognosco
(it's) paved with each piece of my soul <-- I don't want "cum" there right?
parte omne (meae) animae strata est
And it’s (the road has) taken me far (a long distance)
longe me tulit
but left dreams/hope behind <-- I might use "spes" for pl.acc. "hopes"
sed spem deserta est
and I’m longing to dream again
et denuo cupio somniare
I'm also not sure if "somnia" can mean "dreams" as in "goals"