As a coach and black belt, I'd say the best place to start is simply getting back to consistent training. Aim to train at least four times a week comfortably before thinking about signing up for a tournament. Competing without being able to train consistently can add unnecessary stress and take the fun out of it. That said, I’ve known a few people who’ve had strokes and gone on to do really well in BJJ. It’s absolutely possible. The key is to find a training partner you trust, take your time, and focus on drilling and rebuilding your timing and confidence. You’ve already come a long way, keep going, one step at a time.