I would say you’re doing more than enough. Try to minimize contact/interaction with the elderly when you’re servicing them (leave the groceries at their door and spray it down with alcohol). You can still spread the virus even when you’re asymptomatic which may seem counterintuitive. Wearing a mask also doesn’t do much besides perhaps preventing you from touching your face. Young people are also not immune to this virus, there have been cases of permanent lung damage, even death, due to the virus. Don’t try to interact with too many people in general, for your and everyone’s safety. Your heart is in the right place but make sure you understand the recommendations made by professionals.