In small bowl, mash avocado with fork and combine with lemon zest, lemon juice, red pepper flakes, and salt.
In another bowl, combine strawberries with balsamic vinegar and black pepper and set aside.
Toast bread and spread avocado mixture over toasted slice. Top with goat cheese crumbles, microgreens, and strawberries. Finish with a few fresh grinds of black pepper, and drizzle with any juices from strawberries.