I had a long post that did not go through this morning. I'm not going to try and rewrite this.
CEO's of hospitals make high 6 figure salaries. They are not about to risk their job to hire a 14 yo kid. They are not even going to give a 14 yo kid a meeting to hear his presentation on how his landscape business is the best one to serve their hospital.
You do not have a steady experienced crew large enough to service a hospital. You do not have the enough equipment to service a hospital in a timely manner.
At 14 you do not have the knowledge to maintain the Landscape of a hospital. Where I live the good commercial accounts have lawns better then you will find on sod farms. Shrubs that never look like they need to be trimmed. Spring flowers planted in extensive beds all around the property then replaced with summer flowers, then replaced with fall flowers. So many flowers they have 5-6 men crews to plant them.
At 14 do you know what flowers to recommend for each season if they ask you?
Landscaping any large commercial accounts that expects high quality results is not going to trust and take a chance on a 24 yo solo equipped they way you are, let alone a 14 yo.
I salute your work ethic. Best to grow with residentials and some small commercials if you eventually want to go with the later.
Graduate with a AAS degree in Horticulture, Landscape Design, etc.
Build up your equipment list and accounts then you will be equipped to go follow your goals. Luck.