As a freelancer I need to sell slots of my time in schedules. I use simple calendain from F-droid synchronized with Davx5 in nextcloud.

Unforunately Calendly and similar solutions can only be synced with either google calendar, iCloud, or Microsoft Outlook.

I would be happy to move from my self host to a proton calendar solution or something similar but… Damn no way I will share all my life within those big tech nightmare.

Does anyone have a way to sell online slots of my time in a privacy respecting platform?

TIA