Is it possible to re-broadcast or push this tx reward on the mempool?
No, that the coinbase transaction (
not the exhange) of the block that you've mined.
Since it has status of "
0/unconfirmed, not in memory pool", your node doesn't have that block where it's included.
Broadcasting the block (
if you still has it) is no good either since there are already 14 years worth of blocks built on top of it.
If you decided to rescan your blockchain (
in case it's missed during IBD),
You can do it fast by rescanning only the old block heights where it might be included.
Use:
rescanblockchain 0 33000 to scan only blocks from 2009,
replace "
33000" if you want to scan more beyond your projected date, but it'll be slower.