Instagram's bio only supports one clickable link, and it doesn't support a native "message on WhatsApp" button at all. That's a real problem if most of your actual sales conversations happen on WhatsApp, not in Instagram DMs.
The fix: one link, then a real WhatsApp block
Instead of putting a raw WhatsApp number in your bio text (which isn't clickable and looks unprofessional), put your Linkaty page link in your bio, and add a WhatsApp block to the page itself. A visitor taps once from your bio, lands on your page, and taps again to open a real WhatsApp chat with your business number, pre-filled with a message if you want.
This does two things a bare phone number in your bio can't: it's trackable (you'll see exactly how many people tapped through to WhatsApp), and it sits alongside everything else on your page — your product blocks, your Instagram and TikTok links, your QR code — instead of competing for the single bio-link slot.
If WhatsApp is where your real conversations and orders happen, don't bury it in your bio text. Give it its own tappable block.