Exactly. I thought I was being clever using themes and plugins to build super fast... I don't know how to fix the plugins myself or rebuild them.

It's actually not just plugins but also the themes I'm using which add to the complexity. Honestly it's a.total minefield and I think the solution is either to rebuild from scratch or just ask the clients to take over the hosting costs.

Really appreciate you trying to help - the world needs more humans like you!