Tea

What do you mean by weak then?

Much of the charm of higher quality teas come from the subtleties in the flavors, they won't ever be overpowering. They can taste muted with age or improper dosing/brewing. And using too much tea and/or oversteeping will make the flavor profile saturated/flat, rather than be overpowering.

If you're looking for a clear, piercing flavor to "slap you in the face", you'll probably want something with a lot of aromatics, like a smoky Lapsang, a reinforced Earl Grey or other flavored blend, maybe a Gunpowder with it's bitterness, or even Matcha. In the herbals section, Hibiscus and many Rooibos blends might have something of what you're looking for.

And you might want to pair it with flavor enhancers like sugar and milk/cream depending on flavor profile.

A Lapsang sweet tea, or a Matcha Latte might do the trick for you.

What kind of english tea did you tried? In my opinion, the Yorkshire tea was way to strong for me, but maybe it's something for you. I just tried the basic one. But other than that i can't help much, i drink way more green tea.

A few years ago, my sister in law got me a 12 pack sampler of Vahdam teas. It was with that I discovered their turmeric-ginger tea, as well as their cardamom masala, double spice masala, and saffron teas.

Those all have prominent flavors in my opinion and are some of my faves.

I would propose a high quality, loose whole leaf, Assam tea like Assam Tippuk or Assam Gold. If you can´t get them where you reside, or if the flavor of pure Assam is still not strong enough for you, go for an East-Frisian, broken blend, it´s as strong as black teas come. Use 100°C water, steep 3-4 minutes based on your taste.

I recently got a tea sampler from tea and absinth, it has a lot of good teas and I reordered the ones I like, for my daily driver I usually go for yorkshire, or pg tips if it's not available.

Oh man, have you ever tried coffee?