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The X100V is currently hard to come by, and Fujifilm says it has increased production of the X100V to meet demand. But as it turns out, the Fujifilm X100VI seems to have become more popular than expected – many of the cameras were sold out on the day of their release, and retailers didn't anticipate when**.
If you're looking for a small, large-sensor camera with a 35mm equivalent (or similar) lens, and don't want to wait** or prefer to look for a replacement, there are a few other options we can consider.
With the arrival of the X100VI, the used Fujifilm X100V may start to decline in the near future.
The Fujifilm X100V is a lovely camera, and in the past few years, the X100V has also been hard to come by, and with the release of the X100Vi, the ** of used X100V cameras may drop in price, so it's a good value proposition and a small practical street travel camera with a 35mm equivalent lens.
And the difference between Fujifilm X100V and X100VI is not as big as imagined, so as long as it is suitable, it is also a very good alternative.
We previously looked at alternatives to the Fujifilm X100 to try to find out if there were other mirrorless cameras that could achieve a similar effect with a small prime lens. In the process, we find Canon's 22mm f2 lens and Olympus' 17mm f1The 8 lens is the best choice for achieving a 35mm equivalent viewing angle.
However, with Canon discontinuing the EF-M series, if compactness and viewing angles similar to those of the X100 are your main needs, then Olympus will be the better choice. In addition, Olympus' 17mm f1The 8 lens is also superior to Canon's 22mm f2 lens in terms of performance: it has a faster focusing speed, is equipped with a fast manual focus clutch, and is closer to the Fujifilm X100 style in terms of exterior design.
Fixed lens alternatives.
Currently, no other fixed-lens model offers a 35mm-equivalent focal length. Despite this, Ricoh's GR IIIX is close to it in terms of sensors and lenses. It features an APS-C sensor and a 40mm equivalent F28 shots. Although it's much smaller than the Fujifilm X100 series and doesn't have a hybrid viewfinder-like feature, it's a lovely shooting tool with its own loyal fans.
If you prefer a wide-angle viewing angle, then the Ricoh GR III and the excellent Leica Q2 and Q3 are both good choices. These cameras are fascinating.
Second-hand options. 
Obviously, the best Fujifilm X100VI alternative is the X100V. If the X100V is still hard to buy, the X100F is the next best option. This meant some compromises in terms of technology: the loss of a slightly better new lens, an adjustable screen and a 26MP sensor. But the X100F's 24MP sensor is still a very good alternative.
While there are several cameras that rival the X100VI in terms of coverage and photographer-friendly operation, none come close to Fujifilm's unique hybrid viewfinder, and none combine all of these characteristics into such an appealing package. Therefore, we regret to conclude that the best alternative to the X100VI is to continue to wait, or wait for the ** drop of the used X100V.