How to get into DE quant roles?

Im trying to make a career jump from working at tech first companies (startups, middle stage tech companies, no big tech) to working at a quant or high frequency trading firms. Does anyone have any advice or made this switch? Ive always been interested in fintech and my current position does a lot of the same tasks - extremely low latency pipelines, latest prices and price comparison systems, owning large datasets, etc - but for half the pay. Im willing to take time to build towards it if it requires me to relearn statistics or solve math problems, but I would really like a blueprint from some