The best way is to not respond then, the colleague will understand that it is not the time to msg. Also, better to set priorities first. Whether it's work related or personal. Learn to say no when you are being asked to do something that you are not bound to do

Deixar claro que existe uma sobrecarga e/ou que o pedido vai impactar negativamente suas entregas (tanto as que já tem quanto a que foi pedida) é um bom caminho. Deixar de sinalizar é pegar mais uma coisa para fazer apenas pela gentileza não é leal com você mesmo.

When a colleague's frequent requests encroach on your personal time, maintaining boundaries is essential: Politely decline non-essential tasks: Explain your current commitments to ensure your priorities remain clear. Offer alternatives: Suggest other solutions or propose a time when you’re available to help, showing your willingness to collaborate within limits. Communicate consistently: Clearly and regularly articulate your boundaries to set mutual expectations.

Setting boundaries is essential to make a healthy work life balance and protecting one's personal time. Best possible ways would be.., communicate my own availability, understand my own limits, be direct and clear in bringing it up and offer alternatives. One needs to be mindfully assertive with the responses.