Suggest the best self hosting service for n8n

Can someone suggest the best self hosted n8n service which i can use for one client.

Here's the context:

I have more than 20 + active webhook workflows for this client and then created one Ui from v0 which totally connected to supabase.
The company sells products so my workflows handles from the start when lead order from client through amazon or website my system will create labels as per their pincode it will choose the courier service and create the label and save as per that lead thenanaging each customer and also handling new leads mostly entire logistics and leads are done by my workflows
So almost more than 300000 to 400000 executions encounter in n8n, we can't pay n8n vloud such a larger amount

We need suggest which self hosting n8n we should use, suggest something less technical and reliable which will fail and also cost effective.

And also which mode to use normal or queue as most of the workflows are of webhook active workflows.

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