Lemme think:

1. Be patient (lol) although this also goes for me and my fellow straight-shooting martyrs who can also be major pains
2. Get used to double texting and trust they’ll tell you if they’re done with the relationship
3. Set explicit boundaries and stick to them; this may seem counterintuitive but avoidant people often don’t know what normal really is in relationships with confrontational types
4. Communicate!! Tell them exactly what you want, in text and by voice if possible, because they can’t give it to you if they don’t know, and don’t expect people to read your mind since nobody can
5. Don’t feel bad for having expectations and don’t second-guess yourself constantly; they’re adults and they can adjust their behavior even if their character doesn’t change
6. Accept them for who they are and don’t expect they’ll change even if their day-to-day behavior can and should improve. Like I’ve said before, if you want to be with someone, you need to accept their flaws and speak their conflict languages, for real and not just passive aggressively to skip over the most likely very awkward conversation. You need to be able to handle them when things go south and that goes for everybody, regardless of whether they’re avoidant or confrontational

Hope that helps!