Your best bet is to get into a degree with integrated Master such as in Scotland - the last year is devoted to research, either in an industrial (business) setting or in a lab. This would set you up well for a PHD program, which would be funded.
If you’re simply taking classes online and not enrolled at a university, you can take the SAT. The test can be difficult for students whose language is not English and/or who aren’t used to standardized testing but the actual content is relatively easy. A top1% score opens doors to programs such as McDermott at UTD. A perfect score together with a 4.0 gives you a full ride at UAlabama.
What colleges have you already applied to?
Would a major such as Data Science, Applied math, or Informatics be suitable? (Bc CS is very, very much in-demand and as a result it’s even more competitive than the rest.).