Work / English teacher thinking about starting his own business in Poland - any ideas [10]

I'm living not to far from Olsztyn Poland, I have been loving here for 2 years. I have been teaching english and working in a bank but I want to start my own business. I have many ideas and I do not know what one would be the best to open in Poland.

English specking kindergarten/Afterschool so kids would be learning English while in Kindergarten/afterschool. Play activity centre. Translation office . Second hand clothing shop or a Discount store that sells everything from wedding decorations, to birthday decorations,bouncy castles candy machine everything 😋