A memoir is about the person writing it. And as mentioned above, is factual, and if their life was not interesting then there's not much they can...
I would definitely say 'for'. You could try using a comma after clients as well. 'gain the attention of clients, for investment opportunities'
'I still remembered 2008, an eventful year, has witnessed life teemed with miracles that we could survive all disasters occurred frequently with...
I'm not an expert or anything but here goes. Maybe you should try mentioning the central component i.e. 'that old car' somehow before you mention...
Separate names with a comma.