Note that [**] are titles that I recommend. The rest are titles that I have watched and think they are okay-ish, with more or less fulfilling your plot description.
**At Home Dad - as the name implies dad turned into househusband
Boku to Kanojo to Kanojo no Ikiru Michi - wife ran away dad had to quit job to take care daughter
**Egao no Hosoku - Office Lady forcefully turned into manga editor
**Engine - Racing driver terminated contract, return home to drive school bus
Hungry! - Unsuccessful musician turned into chef
Kamo Kyoto e Iku - Quit job to take over family inn
**Naguru Onna - fired at work, turned into boxing trainer with no clues of boxing
Oh My Dad!! - dad who was unsuccessful scientist started anew after wife left
Job transfer from glamorous to humble, not so outstretch career change:
**Apoyan - from main airline company sent off to subsidiary
Call Center no Koibito - sent off to remotely located call center
Coach - sent off to manage remote factory with zero motivation workers
**Dr Koto - surgeon moved to remote island
Gekokujo Kyuji - Sport drama you know the drill, MC quit baseball, turned into teaching, but then forced to be head coach
Hankei 5 Meter - reporter transferred from gossip to daily life section
**Mirai e no 10 Count - Sport drama you know the drill, MC quit boxing then after some years of mess in life got a request to become coach
Nippon Ichi no Saitei Otoko - quit job as TV producer and do freelance journalism (with ulterior motive)
Old Rookie - football player refused to retire works as sports agent while waiting for new contract
**Pretty Proofreader - transferred to proof reading department
Priceless - losing job and fight back
