Any 3's or 5's Ranked Teams To Join?

So the end of the season is coming which means we all get the borders of the skill level from previous season. About 2 months ago me and some friends made a 3's ranked and got to Plat. I told them to not continue (as our skill isnt quite past that) as I did not want to be demoted so I could obtain the Platinum border.

So all in all I was wondering if there are any 3's or 5's teams that are Plat currently for joining? I'm actually fairly skilled but dont want to boast. My 3's team with my friends, they got us demoted back to Gold II and would like to make a higher level by the end of the season. I know with this community Ill get happy responses and some tellin me to eff off. Only wanting what I deserve and what I have to offer... Thanks!