Are you looking for ideas/discussion or just looking for a roleplay? If the latter, I would suggest going through some of the interest check sections, or posting an interest check of your own. I know that isekai is usually pretty popular, and there are some groups in casual section that run those kind of games. There are also some [url=https://www.roleplayerguild.com/forums/16-1x1-interest-checks]one on one[/url] RP checks I have seen that mention doing isekai style. Might have to dig a little bit though. If you're looking for something specific but aren't finding it, it might be a good idea to make your own interest check too!