For someone who played a long time ago, who is getting back into it, and who has been converting all magazine adventures, I think you may like the following:
1. Curse of Strahd
It is VERY true to the original I6 Ravenloft Module but expanded. Tracy and Laura Hickman were involved as consultants and the main writer, Chris Perkins did an excellent job. If you are not up for a horror-themed adventure, then it is not for you, but if you want a campaign that takes the characters to 10th level and which has a sandboxy feel yet with a rich story and well-design plot threads, this is worth checking out.
2. Tomb of Annihilation
Excellent mix of grand, save-the-world story and hex crawl. This seems to have learned from the mistakes of some of the earlier modules. It is not as tight as Curse of Strahd, but doesn't have as much to fill in as Storm Kings Thunder.
3. Tales from the Yawning Portal
If you don't want to commit to a long campaign and want to play old modules in 5e, someone has already done the work for you. A number of classics here.
Keep in mind that you can also run campaigns from the Adventurers League modules, which are affordable and available in PDF format. There are also many good third-party options.
Goodman Games has republished Keep on the Borderlands, though it is pricey and contains the historic 1e versions as well as the 5e version, which is of more interest to historians and collectors.
Frog God Games has successfully funded Rappan Atthuk and City of Brass. Rappan Atthuk should be released shortly. It is a classic mega-dungeon updated for 5e. It will likely be my next campaign. Time to put aside deep stories for an old-fashioned kick-in-the-door, kills monsters, check for traps with your 10' pole dungeon.
If you support the EN World EN5ider Patreon you will have access to the Zeitgeist campaign materials updated for 5e, or you can buy directly from DTRPG. It is a steampunk-type setting, though I'm sure someone will call me out for misusing the term. For more info: https://zeitgeistadventurepath.com/