I'm peruvian, my BF is british. Which visa... ?

Hi everyone! I was a student here in the UK when I met my boyfriend. Since I couldn't get a job afterwards (right after brexit, worst timing ever), I had to leave the UK when my student visa expired. I've got a tourist visa to come visit but is not our plan to keep doing long distance... We're planning on getting married, just not sure if its easier/ better to get married first and then ask for my visa, or come on another type of visa (as a fionce) and then change when we get married in a year or so? Would I be able to work? Thanks for reading this and any comment will be really appreciated!