In general, nobody can tell you what to do with your thesis without knowing exactly what is there and without being an expert in the research subarea you are working in. In other words, as others suggested: talk to your advisor.
On the personal side: I am a mathematician. My undergraduate thesis was about 30 page long and I published two research papers (each about 5 page-long) on the basis of this thesis in a very good math journal. The rest (which was mostly background material and some details of the proofs which professional mathematicians could easily "fill in") I never published in any form. I know of other work by undergraduate students in math who published their undergraduate research in first-rate math journals, some of this work is highly cited. But this is very rare. Most undergraduate dissertations in math are worthless and, accordingly, are not published. (The situation is quite a bit different in "lab sciences.") I do not see why philosophy would be much different from math regarding publishability of undergraduate research. For instance, some of philosophical work is close to logic and I expect that a high-quality undergraduate research in such area would be publishable in the form of one or several shorter research papers.