Form 8189 & SS8 Help Please

I worked for a company since 2022 as thier social media manager.  I started as an employee but after several months I couldn't afford to live off the salary of $2,000 a month with the taxes taken out so the owner made me a 1099 so I could afford to pay my bills.  He layed me off early 2025 and gave his granddaughter my position as a W2 employee.  My question is do I need to file both the SS8 and 8919 forms for all years? Also, after the determination is completed,  will I received a refund on the taxes I over paid through the years? This California and per their guidelines I was definitely considered an employee not an independent contractor.  I only worked for him. Thank you!