Looking for a chair for Work From Home, am looking for any sort of chairs that are affordable yet practical for work for home purposes. Because my back has been aching due to the long seating on a very uncomfortable plastic chair.
Definitely I am always keen to consider anything that is best value on money spent.

Not sure, if anyone have any recommendations?

I heard about Alterseat, but not sure if the price tag is really worth with all the internet marketing hype? Or Am Office? Or any sort of gaming chair?

Herman Miller is like 5k though

Kinda agree with ya, the gaming chairs nowadays are a bit hype up too much. It's quite overrated IMO... Unless you aim around 2k for a SecretLab chair...