Investment strategy for SD Roth IRA

[Jerry Jones]

I remember I saw a topic like" What would you do with $50K IRA account" started by Josh, but could not find it anymore.

I am thinking about rolling over my old not performing 401K into a Roth IRA for a better return and diversify. Ideally I want to be a passive investor for this account. What options do I have and what's the expected return for each option?
Here is what I got right now:
1. work as private lender. There are some government contract project which offers 17.88% rate with $50K minimum investment.
2. buy tax lien using some tax lien investing company. I was recommended the company called pip-west, which focuses on the tax lien in Illionous and claimesa 24%~36% return but they charge 6% setup fee at beginning and 2% continuous fee for all the investment fund.

Is there any other reputable tax-lien company with lower fees?

Also, is there any other/better options availble?

Thanks very much for your feedback

Jerry