Late realisation regarding projects I’ve worked on for the client . I feel I’m screwed . How do I get out of this situation ?

Context- I’m 30 YO. Have 4.5 years of overall experience and 3.5 years in User Experience Design. Ive got a background in physical product design & I landed in UX due to non availability of 3D projects in TCS.

My leaning in UX since 3.5 years has been hands-on. I’ve worked for a client for almost 3.5 years as a user experience designer. I used to work in silo 95% of the time and hence didn’t know the right YX methodology to use during the UX research process, didn’t know the rights questions that I need to ask to both the stakeholders and users as I didn’t educate myself through any online courses regarding the same. Before I graduated, I was told be a few friends that ‘UX is doable and it’s very easy up learn. If you can pursue physical product design, you can easily do UX.

Fast forward 4 years, I’m compiling all the work I’ve done for the client and I’ve realised a lot of loopholes and lack of depth both in the design process and in the designs. Neither I asked the right questions during the User interview nor my design fully solves the user’s problems completely. I have to add these 2 projects I d worked for the client as I need to showcase real world projects in my portfolio.

I want to switch not just due to bad pay. I want to switch for better exposure, for growth and to learn to work in a team.

I can’t go to the client and gain more clarity on the needs and requirements of the project as I no longer work with them.

I will re-educate myself regarding the user research methodologies, best UX practices , UI design principles etc.

But how do I showcase these projects which are flawed and has a lot of loopholes?