If you follow elite track athletes on social media, you'll notice a trend in the next few months...altitude camp! A lot of groups do 3-5 week trips to altitude before the start of their season (NorCal, Little Wing), or live at high elevations year round (Steph Rothstein, Kara Goucher!).
Consider where you started five weeks ago and where you are today. You're doing it, great job! You should be proud of all the hard work you've put in and excited about the weeks to come. When you started this training plan, you embraced your current fitness level and made a goal to train hard for eight weeks to run your first or fastest 5k.