There's been SOME activity in MR in the last couple years... MR1&2DX is a remaster of the first 2 games with some QoL improvements, on Switch, Steam, iOS, released in 2021 Ultra Kaiju Monster Rancher is a crossover, though only on Switch, released in 2022 LINE:Monster Farm is a JP only mobile gacha game released in 2023, but some folks hope it will come to the west... it has some amazing artwork.
There's also hope for MR3&4 "DX" release but those weren't very financially successful originally, so it's probably unlikely they'll be rereleased, but everyone's huffin' that hopium.