How to say no politely - advice requested

Asking for advice - how do you say no to things you know will be a poor use of your time?

Can you just say out loud, "I'd love to help but this isn't the best use of my time right now"?

I struggle with this - I like helping, I don't want to hurt people's feelings, I don't want to ignore and I don't want to mislead.

Help me, please!

#founders #startups #venturecapital #buildinginpublic #investinginpublic