If you want others to respect your time and energy, then you must respect it first.
You can, in a kind but firm way, say “no” when you absolutely cannot do another thing.
When you respect yourself, you will find others will treat you more respectfully as well. If your schedule feels absolutely full and you have room for not one single extra task (including time for you), you can ask your Angels to send you a scheduling guide or other ideas to clear your time.
You are worth it.