freelance work, that is what you should be doing. find a rate that balance expencs and profit

Apart from posting in Help Wanted or Offered and mentioning [paid] in the tile, I'm not sure what to suggest.

I'd be interested in getting a look at your portfolio - do you have a site with some of your work available to browse? I'm a retired musician myself that moved into (with a stop-off in copywriting) writing/producing VNs, so I appreciate what goes in to a good soundtrack, and royalty-free options are... lacking.

You could try the "knock on doors" approach... find games that are in development that you would like to work on, and send them a message asking if they need a composer. You'll have to send a lot of emails and most of the responses will be "already have one" or "can't afford one." But it's a nice active way to put your name out there, and reach people who might never have stumbled on your portfolio or help offered post. Look for games in the "sweet spot" of development - if it's too early in the process, they might not be ready to hire you and will forget by the time they are. Too late, and they probably already decided on music. So its best to find games that close to or just entering the "polish" phase, when the developers have a solid foundation and a good idea of what music they will need.