Quickly downvote answers lacking experience, and leave a comment repudiating their disclaimed ignorance, if any
As Miniman points out, the problems that lead to these questions being closed are not usually so much an issue with the questions themselves but with the very low-quality off-the-cuff answers they often attract. The best thing you can do to keep a question like this open as a querent is to fend off those sorts of low-quality answers. How you frame the question is an important part of that, and you can get a lot of mileage out of a short section explaining the general requirements you are looking for in an answer (e.g. has been tested before in practice). That said, you are still very likely, especially for popular tags, to get a lot of bad answers, and there's more you can do. Actively warding off bad answers from your question even after
posting it is an important part of getting questions you care about answered well.
As the querent, you get a notification whenever someone answers one of your questions, which allows you the opportunity (if you are not particularly unlucky or asking about 5th edition D&D) to respond to an answer before anyone else can. Especially for D&D questions of any edition, ignorant drive-by voting is a huge factor in a post's score. Answers that are currently rated 0 or higher will be upvoted regardless of their merits, more intensely the higher-rated they currently are. Answers that are rated -2 or lower, especially if there is an upvoted comment deconstructing the problems with the answer, would draw drive-by down votes but there's a rep barrier so instead they just don't draw drive-by upvotes and sink negative at a more moderate pace via drive-by voting from established community members (who should know better, but hey) if it's 5th edition or a couple of big tags.
Regardless, you need to be that initial downvote and critical comment. It doesn't always work, but in my experience with FATE and 3.X questions you are much more likely to stave off the torrent of insulting bad answers if you liberally provide immediate negative feedback than if you don't. Frequently these sorts of answers will start with 'I've never played X, but' or 'I've never had this happen, but'. Those are good things to object to in a comment. If an answer is more of the 'do X ' kind, then a comment saying 'Have you tested this? How did it work in practice?' can be good. If you have the expertise, you can add "How did you deal with [X,Y,Z obvious practical problems with untested homebrew solution]?"
Ironically, if you can get your question off the front page, it's likely the only people answering it will be qualified and the answers you get, though they may take a very long time, will be much better on average. You'll still get a lot of expert attention as long as the question is 'unanswered'-- i.e. it has no answers rated higher than 0-- but you will miss out on that if even one of the bad answers can retain a rating of +1.
Also, edge cases where people are unlikely to have experience are equally fine in theory, though it will be harder to get good answers in practice. The real problem is that our community hates a vacuum and seems to feel a need to post something even if it's not very good if a question doesn't have any answers yet.