I take a methodical and pragmatic work approach. 

If I had a bunch of houses and hired a plumber to fix a leak in the first house and he “fixed it” then six months his method fails.

Whomever will do her taxes when she does sell, (can be done prior, and should be asap) will have to submit a change of accounting method form .....I've had multiple clients that never took depreciation and when they sold, we had to fix it...doing your own taxes isn't as easy as some tax software companies make it seem 

Since you aren't looking at the BRRR method, I am assuming you want something that is turnkey.

Obviously the numbers and location would determine which is the best option for me but these would be my preferred methods. 

Some have used this method to obtain 100% financing.

Definitely do more research on the BRRRR method as that sounds like what you're trying to do.

Is the only way to pay for a Reno for my childhood home to sell my current home or is there a method I'm not familiar with that I can use my current homes value to help me out??

Many opt for other investing methods in their SDIRA like private lending, crypto, private equity...anything except collectibles and life insurance.Note that a Solo 401k is exempt from UBIT on leveraged real estate so if you have self employment activity and no full time employees save for you and your spouse you should consider the Solo K as an option. 

All methods are achievable with the right knowledge and mindset.