Still have 2 ps vita's, one I bought cheap that has a faulty cartridge bay that is setup for my US psn account and another I've had for a longer time. Both the original model with the glorious OLED displays. Still use for remote play and psn plus still provides 1-2 games for Vita per month. Super cheap portable gaming.
The only issue I have is one has a 4GB card and the other 8GB so I often have to juggle games and can't have a wide selection stored on the cards. Unless I see a larger card dirt cheap I doubt I'll upgrade it as it gets less use nowadays. Hoping to see a reduced size Switch model that is a more viable portable for me sometime in the future that will probably take over the Vita roles or maybe a new portable console from someone else. Despite the Vita's lack of success I've always found it to have a good selection of games plus the bonus of remote play.
To be honest though I've also built up a large library of android games and a decent android compatible portable would do me with decent gamepad mapping of games. Android seems to be getting a much wider range of games plus very low prices and some are getting very impressive. It's where the majority of portable gaming is done nowadays by some margin.