Those are the easiest and most straightforward options, but I'm going to disagree with the others that a conjugal partnership application is absolutely impossible in your situation. The regulations and manuals are full of hedging like "expected to," "mainly," "usually," "not normally," and "might."
You haven't given enough information here for me to say whether you are in a qualifying relationship, but you are not automatically disqualified just cause your partner is American. However, the outcome depends on the judgement of the visa officer who reviews your case and how they will interpret the regulations and procedures. You are going to have to argue a strong case, as if you were a lawyer in court trying to persuade a jury, and if you get an unsympathetic officer, you might have to appeal, which can take considerable time. If you are willing to gamble about $1500 in application and medical fees and about a year (more or less) of time, you might try the conjugal route if you have a relationship that qualifies.
If you need to appeal, there will be legal fees and it could take 2 to 3 years, though they are trying to get many cases cleared in a year. It's possible that you still could fail.
They do not want you to ruin your credit rating or declare bankruptcy -- they want you to get married. They don't want you to "visit" for a year, either, though they routinely approve such visits to people preparing PR applications.
There is a lot more I would like to say, but that's all I have time for at the moment. I know of two Canadian-American couples who were approved in a conjugal partnership, but one of those couple had to appeal. When I get time, I will try to explain why they were usual case that were successful.