Drain cleared a year ago, backed up again now

A year ago our main drain going from our house to the street was hydro jetted. I even dug up and installed a clean out closer to the road so it would be easier to snake if needed. Maybe 7 months ago I put in root killer that’s supposed to be good for a year. I never paid to have the line camera because the hydro jetting cleared it perfectly and everything flowed great after that so I didn’t see the need to camera. Plus I figured it was roots that caused it so the hydro jetting should’ve cleared that completely. So now a year later. It’s backed up again. I have no idea what to do. I can’t afford to keep paying to get it jetted. I’ll try to rent one of the auger snakes or whatever and see what I can do tomorrow but I don’t know if that will fix it. At this point I have no idea what is going on. It didn’t back up for a whole year so it couldn’t be pipe separation/damage from jetting because it would’ve backed up quicker. Anyone have thoughts? :(