The speaker was heavily reliant on their retail shop's income and was caught off guard by the rise of internet shopping, realizing the need to adapt quickly to survive, as many businesses were failing.
"i was so heavily focused on one stream of income from my retail shop so when internet shopping struck i was completely taken by surprise it was really sink or swim everyone i knew was getting wiped out of business and i knew it was only a matter of time before that was going to happen to me if i didn't quickly adapt to the times"