increasing HA

Hello,

I am looking after some advice about solution allowing to increase High availability?

Here is a bit of context :

I have an Master-Slave architecture

 - 1 master

 - 2 asynchronous slaves using replication slot

 - backup is made with barman using replication slot

 - Wal archiving is done towards barman server

I think 3 axes could be improved ( I am totaly novice with these):

- using of a proxy

 I found HAproxy.

 Could you advice any others solutions to explore or share your experience?

- using an automatick failover

 I found PAF
 Could you advice any others solutions to explore or share your experience?

- using a tool for fencing a failing node

Ideally, I aimagine to disable network traffic in I/O to prevent client connecting and exchange between backup server failling server + on postgesql server disable automatic restart of the service.

Could you share you experience about it?

- Maybe an other axe to explore ?

Thank you

Thomas