I think your insecurity about your race plan is from lack of confidence in your ability to run the full 26.2 miles at a given sub-3 hour pace.
Looking at your Strava workouts, your long runs were at a much slower than marathon pace, and very few of those runs were over 16 miles.
If you want to run the full 26.2 mile marathon at, say, 6:45/mile pace, then you should be able to run 22 or 20 miles, averaging 6:45/mile.
You can start at a shorter distance, say 12-16mi at a slower pace, and work up to 20mi+ at or close to race pace.
You can play around with planning a race plan with these race simulation workouts, i.e. all miles at race pace or half distance at race pace+5secs, last half at race pace-5secs, etc.
Also check into marathon training plans for ideas of how to progress and schedule workouts until race day.
