Taking your considerations into account, bikes we would recommend taking a look at are the Triumph Speed 400 and Scrambler 400 X / XC. 

Both will offer you considerably higher performance than your Yezdi bike and will also be comfortable enough to handle daily commuting duties while being brisk enough on the highway as well. 

If you want an air-cooled, torquey engine, then you could even take a look at the Harley-Davidson X440, which is a comfortable neo-retro roadster that has decent performance. 

Take a test ride of the machines you shortlist before picking one. 

Between the Honda H'ness CB350 and the Triumph Scrambler 400 X, we would steer you toward the Triumph bike purely because it offers you significantly higher performance for not that much more money. The Scrambler is also a smooth, comfortable do-it-all motorcycle which has good passenger accommodations as well. The H'ness is also comfortable for two-up riding and is a good city bike, but it will not be able to match the Triumph's performance advantage. 

We would advise you not to go for the Royal Enfield Super Meteor 650 because it is a rather heavy bike at 240kg, which will not be the best fit on traffic-riddled city roads. Moreover, its stiff rear suspension will be the bigger reason to look elsewhere. If you want a RE 650, we would recommend taking a look at the Royal Enfield Interceptor, as that has more pliant suspension and is also much lighter. 

Since you have mentioned you want a powerful motorcycle, we would recommend you look at the Triumph Scrambler 400X, KTM 250 Adventure and TVS Apache RTX 300 in the ADV / Scrambler category. Of the three, the Triumph bike is the most powerful, but it is also pleasantly usable inside the city, whereas the KTM and TVS are more do-it-all machines that will also be wonderful on a day-to-day basis. 

Coming to the Xpulse 421, there's no official communication from Hero on when it will be launched, so we would recommend going with any of the other options you are considering. 

Take a test ride of whichever option you shortlist before you choose. 

Both the Bajaj Dominar 400 and Triumph Scrambler 400 X are reasonably reliable and hassle-free machines, and considering they are both made by Bajaj, they should be light on the wallet in terms of maintenance. We recommend choosing the one you are more comfortable with and the one that has a service centre close to you. 

Coming to why we haven't reviewed the 2025 Dominar 400, that's because the bike is mechanically the same as when we reviewed it last in 2021, and the only tangible difference is the new LCD borrowed from the Pulsar NS400Z.

Both the bikes you have mentioned will fit the bill for your use case. However, both the Triumph Scrambler 400 X and the TVS Apache RTX 300 have tall seat heights (830mm or more), and for a new rider of your stature, they could feel like a little too much, especially at slow speeds and during off-roading. We would strongly recommend a test ride of both before you decide to go ahead with your purchase. 

If these two prove to be too tall for you, something more street-biased (and crucially, lower) like the Triumph Speed 400 or Apache RTR 310 from these respective brands would be a good fit.