If someone has blocked you on Android, you won't be able to directly send them text messages or receive their messages. When a person blocks you, it means they've intentionally restricted communication with you.
However, you can still try the following options to reach out indirectly or resolve the situation:
Try a different phone number: If you have a different phone number that hasn't been blocked by the person, you can try calling them on that line.
Try contacting them through a different channel if you have one: You might try contacting them via email or social media if you have those options for communication. Yet respect them and take into account how they wish to be reached.