You can't be active on too many social media, with all the floods of mails and messages.
And having your own website is already a tedious job.
I don't know if it would be useful (with a filter or the help of the administration of the concerned social media) to simply reduce your activity and the number of contacts, messages and notifications on the most important social media, keeping in contact with the few, who are important to you, just in case, or to use your closest, as much as possible professional, contacts on these sites as intermediaries.