:~$ iw dev wlan0 link
command failed: No such device (-19)
:~$ iw dev wlan0 get power_save
command failed: No such device (-19)

Seems like there is no device named wlan0. I think it is wlo1 instead of wlan0 
on my laptop. When I replace wlan0 with wlo1, the results are as follows:
:~$ iw dev wlo1 link
Connected to 50:2b:73:74:69:91 (on wlo1)
        SSID: Crossroads
        freq: 2412
        signal: -63 dBm
        tx bitrate: 150.0 MBit/s
:~$ iw dev wlo1 get power_save
Power save: on

:~$ iw dev wlan0 set power_save off
command failed: No such device (-19)
:~$ iw dev wlo1 set power_save off
command failed: Operation not permitted (-1)
:~$ sudo iw dev wlo1 set power_save off
[sudo] password for soumadeepsarkar1: 
:~$ iw dev wlo1 get power_save
Power save: off

Even after setting power_save to off, it speed doesn't improve.
These are the speeds tested using speedtest.net after setting power_save to off

 PING ms
3
 DOWNLOAD Mbps
4.23
 UPLOAD Mbps
6.42

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1937926

Title:
  Realtek 8821C PCIe Wifi driver problem, wifi speed very slow on
  connecting to 2.4ghz network.

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