Yes, you can merit yourself but you would need two accounts for it. A lot people do this on the platform and they get away with it. People own multiple accounts and once they get merited on one account, they send that merit to their other account. This is very unfair because it denies other people who actually deserve the merits.
It would be very helpful if measures were taken to prevent self meriting as I just explained.
OP didn't say about giving merit to multiple account, you will understand if you read OP again. Said about giving merit from own account to same account which is not possible in reality. Community members have already discussed this in detail in this thread and told the op how and why it is not possible to give self merit. So you should read this thread again and that will further help you to increase your knowledge about Merit.