In the future, all you have to do is hit ALT and 1-6-9 while you have the ALT key pressed down and the cursor in the caption field. The copyright sign will appear under the photo then you can type in asg or whatever else you want. That makes it easier.
There's something called SRO that the algorithm loves. I've never quite understood it myself (I'm a writer, not a geek) but you can Google it. SRO reads your headlines. And the SRO doesn't like punctuation in the headline. It's still your decision but remember that. SRO is what drives people to your posts. If the SRO doesn't like what it sees it won't help you. That's the bottom line.
Then the SRO also likes subheads. Again, your choice. Type in and then highlight in subhead script. Keep it short (only one line) and again avoid punctuation and capitalization.
Any other questions ask me, or there is a guy on Medium, Casey Boticello who posts all the answers in easy how-to's: