My iphone X is showing no service since last night and i have tried all the required way to solve this problem but still it is not working

Remove and reinsert the SIM card.

If it doesn't help contact your carrier, maybe the SIM card is damaged, ask for a replaced (new) card. Normally it is free.

Also  ask to check if the SIM tray is bent, as even a tiny misalignment can cause the SIM card to not fully connect with the internal contacts in your iPhone.

If it doesn't help see these Apple articles below:

If you see No Service, Searching, or SOS on your iPhone or iPad

If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Manually update your carrier settings on your iPhone or iPad

Manually update your carrier settings on your iPhone or iPad - Apple Support

Update your network provider settings manually on your iPhone or iPad

Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)

siddhi65 wrote: "...the battery health is low that is 75% and yes it is original one..."

75% is not healthy and so an iPhone with such a weak battery cannot make a connection. Have the aging battery replaced and all will (probably) be well:

iPhone Battery & Power Repair

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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reset the network settings and check again.

If the problem not solved, replace the sim with some other sim card and check it.

siddhi ~ What version of iOS is your iPhone X running?...

Settings > General > About > Software Version

And does it still have its original battery?

Also, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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