every city you mentioned has its good and bad area's

concentrate on locations(streets/suburbs) that have local amenities and understand the type of customer you wish to be renters

for instance if its near a hospital, aim to promote the house to doctors(high income)
or if you are looking to air BnB look for locations near tourist/entertainment/sports venues

as for you looking for investors... well if you cant show experience and funding records of already doing real estate, no one will invest in you, especially not strangers you/they met on the internet.. basically you mentioning lots of locations around the world means that you are not even bothering to want to manage the location near your own personal location, nor wanting to register a company in your own name/location. this scares people(red flag) as you want to just take money and not have responsibility. it also shows you have lack of a plan, by just spouting out random cities

if you cant even get a relative/friend/work colleague/your own bank to invest in you and instead you want to seek stranger investment. it starts raising more red flags, especially with the other things said about your lack of understanding the area's/customer types

by the looks of your proposal such as not using locations near you to manage, not understanding the advantages/disadvantages of each city you did mention. and not having money to help. shows you are not offering anything yourself to any deal. anyone else can just do their own property search without you and get same results. so why need to involve you or hand funds to you... makes no sense apart from revealing dozens of scamming possible red flags..