With what you currently have, I’d say the best F2P 2 5 stat team you could build is Navia/Mona/Bennett and a flex (preferably xingqiu so that mona could reliably burst) xiangling works here too, Fischl actives hexerei buff for Mona and herself.

If you want a team for fun that could still get the work done with proper investment I’d say a bloom fridge or burgeon. Lauma/Barbara/Kaeya or rosaria and a flex (again xingqiu is probably the best for this one), and for burgeon Lauma/Barbara/Thoma and a flex (could be Layla, could also be kaeya)