I have a 12 year old linden tree that until about three years ago was thriving. However over the past three years something strange is happening. The leaves are much smaller and less dense than usual, but it continues to make lots of flowers. I expected after the first year that it would just die, but it keeps going, without improving and without getting worse (at least not that I notice). Please see below three pictures, one from 2017 and three from this year. I am not sure what to do, just cut it and be done with it? Or is there hope for recovery?