Depending on the country where you live the options are different and of the 5 that you name 2 are executable anywhere, these are those of family and friends and the sale of properties. When it became fashionable in my country the song of Roberto Carlos in which he wished to have a million friends, the young people joked that if each one gave us 1 bolivar we would be millionaires, and although it was sarcastic it is not far from reality if instead of giving it to us we can involve them in productive projects, in fact in many countries family cooperatives have been successful and selling properties is something basic, since we are used to accumulate things that we do not use or that have some defect and as the adage says, the garbage of some is the wealth of others, good subject.