When I taught 3 yo SS and 4-5 yo SS, I used this structure:
9:00-9:05 arrival – coloring sheets or quiet game at table
9:05-9:15 or 9:20 singing – active. Bible songs like Zaccheus was a wee little man; I may never march in the infantry; peter, James, and John in the fishing boat – I’d get us started and then take requests. This helps immensely with getting the wiggles out
9:20-9:35 – tell the Bible story from the actual Bible but paraphrasing with felt board – the kids all loved this – kids sat in chairs in semi circle, but the floor works, too
9:35-9:40 – we asked questions via a game format, but narration could easily be used instead – we did this in a moving, active way
9:40-9:45 – memory work (we memorized books of Bible, disciples, 12 tribes, and various verses at different times), on floor together mostly, but occasionally one on one
9:45-10:15 – outside or inside free play (sometimes we’d play Bible bingo)
This gave us some structure which in my opinion is needed, but kept lessons or sections short, varied, and interesting.
HTH you think through some options.
Christie