If you have already finished v0.4, note that v0.4.1 mainly offers bug fixes and polish; you do not need to restart your save unless you encountered a progression-blocking bug.
For community-led walkthroughs and technical help, the F95zone discussion thread is the primary hub for this title. Big City's Pleasures v0.4/v0.4.1/v0.4.2 - LINKS - Patreon
You can access the official cheats by clicking on the Main Character (MC) in the Stats Screen . This allows you to bypass resource grinding or unlock specific paths.