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.
While it is possible to merit with an alt account, doing so is not recommended.
If you look through the Reputation board, you'll notice that there are threads open against those who were caught in the act of self-meriting their own posts using their alt account.
It would be very helpful if measures were taken to prevent self meriting as I just explained.
Suspicious account activity is constantly being investigated, and those found breaking rules that are frowned upon by forum members are constantly being exposed and punished, either with a negative tag or being banned.