Say it straight or don't say it at all.
A lot of people complain about behavior they quietly trained. If you allow constant interruptions, endless text conversations, and low-value access to your time, do not act surprised when that becomes the standard.
Most people do not have a motivation problem or an energy problem. They are exhausted because they trained everyone around them to consume their time, attention, and mental bandwidth without limits.
A lot of people are not kind. They are conflict-avoidant. They hand over control, overcommit, and say yes to things they do not want, then call it being a good person.