Have you tried a Sercial or Verdelho Madeira? Almost all Madeira sold is Malmsey, which is the sweetest. You'll sometimes find bottles of the Boal style, the next sweetest, sold as a digestif if the restaurant is a little more discerning.
But the best styles, IMO, are Sercial and Verdelho. Sercial is dry and Verdelho medium-dry[1], IMO have more fascinating flavors, and tend to be more acidic than the sweeter styles, which as a soda drinker I especially like. Both are really good for extended sessions as they're not nearly as cloying as Port. And the Sercial in particular suitable for drinking by the glassful with dinner if you care to splurge.
And one of the greatest things about Madeira is that it's already completely oxidized. Opinions very, but as for myself I still enjoy bottles of Madeira that I opened years ago. By contrast, IME an opened bottle of Tawny Port starts to lose its punch after a week or so (on the outside). This is why you can still buy Madeira from the 1800s and even 1700s and still enjoy it today. The oldest enjoyable Ports (Ruby or Tawny) tend to only go back 50 or 100 years if they've been preserved well.
If you're not a regular drinker (like me) or are the sole drinker in a household (like me), and don't enjoy hard liquor (like me), then the long shelf-life of opened bottles is really nice.
The Historic Series Madeiras from the Rare Wine Co are good exemplars of the various styles
https://www.rarewineco.com/rare-wine-co-historic-series-madeira
I don't know if they still do, but they used to offer a 4 half bottle sample gift set.
[1] Though both still sweeter and thicker (mouth feel) than a Sherry, with less of the distilled spirits-like flavor/smell coming through--which is why I dislike Sherry.