In this particular case you probably brought attention of some people to your answer by mentioning your post in this question on meta. And now, when you edited your question, the question was bumped and it got on the front page again (for the users who sort the questions by recent activity, when browsing the site). This also get the question a few more views.
But this is not solution in general - using this frequently for this purpose would be kind of misuse of meta and of editing. (It is perfectly fine to link some question on meta to show an example of problem you are asking about. It is ok to editing question, when an edit improves it. But neither of these two should be used as a guise for bringing attention to a particular question.)
The suggestions which I can think of are the following:
- You could mention your question in chat. Maybe you will be lucky enough to find there someone who notices your message and will be willing to have a look at your answer. (But the chat room is quite lively, so it is relatively easy that you message will go unnoticed among many messages that are posted there. Apart from the main chat room it is possible to try a room specific to area of mathematics where your question belongs - if such room exists. These rooms are typically much less active than the main chat room. But as a trade-off, lower activity means that your message will be longer visible among the most recent messages in the room.)
- I think offering a bounty is also a reasonable idea. Notice that you can add custom message when offering a bounty. You should explain there, that you are looking for comments on your solution. And that if someone posts an answer with explanation what can be improved in your solution, if such an answer is helpful, you will award bounty to that answer. (Again, there is a lot of bounties on this site, so it is quite possible that your bounty will go unnoticed. It is also possible that some people, who are attracted by the bounty, will not notice the custom message.)
This is an unusual type of bounty, so let us wait and see what other members of our community think about this approach. But since I was not able to think of some better solution, I suggested these two possibilities. Of the two, I personally like mentioning the post in chat better.
In any case you seem to have followed advice given here: Best way of asking "check my proof" questions (Post a question, mention that you want people to check your solution, post your solution as an answer.) So I do not think there is much more you can do here.