when death is knocking at my door

In this poem, I believe that Keats is talking about the things he will do before he dies, kind of like a bucket list. He wants to have all of his affairs taken care of so he can "stand alone, and think till love and fame to nothingness do sink". This poem seems to be written to someone that he cares about, or perhaps a love because of the line "and when i feel, fair creature of an hour, that i shall never look upon thee more, never have relish in the fairy power of unreflecting love". Maybe this person is someone that he has admired from afar because he has not got the chance to yet experience the power of unreflecting love. This is something that he would want to do before death comes knocking, and this is his way of letting his love know how he feels.