What are my lounge options and transit requirements at Suvarnabhumi Airport for a 14-hour layover?

The ONLY way you can transit in Bangkok is if you have a through booking on a single itinerary that includes all of your bags and everything.

If you need to collect your baggage and/or leave the airside area to check in to your next flight, it won't be possible. That means you have to go through immigration and meet all entry requirements for Thailand.

This includes having $20,000 insurance, applying for and receiving a Thailand Pass, and booking one night in an SHA Extra Plus hotel where you will be taken to immediately after clearing immigration, and a PCR test to be performed at the hotel or on the way there. You will then be locked in your room and cannot leave until your test results come back negative which can take 6-24 hours. If they come back positive you'll be required to isolate in the hotel or a hospitel for 10 days minimum.

I hate to be the bearer of bad news, but flights from Laos are not through bookings. Don't worry about the airport, you're going to get spending a night at a quarantine hotel waiting for your test results!

Last time I was there about 8 weeks ago everything was closed

Are your flights all on one ticket or two separate tickets?

I don’t want you have any nasty surprises when trying to board to BKK

Miracle lounge in D is open, not sure about the other ones.

Star Alliance has 15 lounges at Suvarnabumi.

Miracle lounge was open 2 days ago

Make compost to improve your own soil.