Hilton are actively offering to match your status with any other Hotel program. The offer is valid now and I don’t know how long this offer will last. Your status match with Hilton HHonors will be valid through March 2018.
Hilton have set up a status match page to make it easy. All you need is your name, email, a Hilton HHonors account that you can sign up for here and a .jpg screen shot of the program from which you want to match. For this offer, Hilton require both a screenshot of your current account status/membership card plus proof of stay within the last 12 months.
So chose the hotel program where you have the highest status and match away. Hopefully you can match to Diamond, but don’t worry if you can only make Gold as that should still get you the most important benefits.
You can compare benefits for the various Hilton HHonors tiers here. With Gold or Diamond you’ll usually get an upgraded room, almost always receive free wi-fi and mostly access to the Executive Lounge where you can enjoy free drinks and snacks.