High side smart load switch input protection
To fully answer this you have to define what the electrical threats are that you are trying to protect your circuit against. For instance, you've used a bidirectional TVS at the input but, what perceived threat is the TVS there to deal with?
You have to decide this. Then you might need to add a fuse or a crowbar circuit or something else. I'd certainly use a protection zener on the gate-source and you don't need anything like a 2 watt resistor feeding the gate.

Do I need to add a fast blow fuse at input for an overcurrent
situation or with the tvs is enough?

If it's an ESD threat then certainly you won't need a fuse because ESD events are well defined in energy levels and peak currents and most TVS devices are designed to work with ESD. However, if the &quot;threat&quot; is indirect lightning surges you may well have to fit a fuse should the TVS diode &quot;operate&quot; but fail short circuit. However, the 1N6384 is a beast and can handle a 600 watt &quot;dump&quot; for 10 ms i.e. it certainly looks good for some indirect lightning events. But, the devil is in the detail.
I reiterate - define the threats.