Your first step is to become acquainted with how tech is used in finance + figure out which tech role you’d like to apply finance to. Every role in tech is available in the finance sector. Ex: Financial Data Analyst, Fraud Detection Engineer, etc
Brainstorm timelines, transferable skills, interests, etc to see which role makes sense to you. ChatGPT can help with this since you can upload your resume. If you need more in depth help, I offer career consultations.