How do I know what to upgrade next?

I currently have:

2x ice cream shop level 5 and 6
2x T-shirt stand level 1
2x laundromat level 4
2x tattoo parlour level 4
2x Italian restaurant level 2
2x house level 2 and 3
Rest of Type A buildings level 1/2/3.

Currently completing the $40k expansion. Level 12. $3776 IPH. $12525 on hand.

Can anyone give me a rough plan? At the moment I'm just thinking upgrade ice cream shops to 10 then save up for movie theatre?