Because like much of the Carribean, one of the prime industries in Cuba prior to the embargo was tourism, and distance is a factor in tourism
There are 550m people in south america, central america, and mexico with a combined $6.5 trillion GDP.
If Cuba is unable to convince any of the 550m people near them to visit, maybe it's not a tourist attraction and they should find something else to do.
Actually, lots of them do. Its still a lot less money coming in from when the same people did and it was a popular destination with much wealthier US tourists.
I also think you completely missed the second (original, not quoted) paragraph in the past you responded too.
There are 550m people in south america, central america, and mexico with a combined $6.5 trillion GDP.
If Cuba is unable to convince any of the 550m people near them to visit, maybe it's not a tourist attraction and they should find something else to do.