8 months is ample time, but you need to sort out your "chronic injury". Who diagnosed you and what did they/are you doing to work round the problem? Don't try and increase the miles while you still have the injury niggling on.
From your profile you've previously run a marathon (or more than one) so you're obviously capable of covering the distance
Underneath the reply box there should be a 'report to moderator' button. I suggest you use this and it will at least bring this to the attention of someone- who in turn may be able to pass your concerns onto someone who can sort it out.
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