In fact I believe it gonna be quite easy for me to run 17:30 @ 5000m next year . It only requires my favorite maxVO2 interval 20 x 400m to be at 82-83 sec per rep. A couple of years ago I coached a Swede then aged 60 and with far from my basic talent ( In my only 800m race I did a 1:58. with opening lap at 54 sec). I got him down to running the 20x 400m @ 75-76 sec with 60 sec rest and controlled feeling. Out from this I think it really will be easy for me to run 20 x 400m @ 82-83 sec. and threshold intervals @ 3:45 min/ km. ( 6:00 mile pace) with lactate at about 3-4 mmol for most effective threshold improvement and complement with easy steady distance @ around 5 min/ km( 8 min mile pace) . Out from my coaching of hundreds of runners at different levels from ' hobby joggers' to world class elite I know I will be guaranteed quite easy to run at least a 17: 30. 5000m. next year, this year had given me a silver medal in Masters World Champs age group 65-69 ! 🇸🇪🧙♂️