My interests includes but is not limited to co-listing Airbnb, short term, medium term or long term rental properties just to include a few.

Next, your using limited visual range photos.

Whether we agree with these items or not, the following are inflationary government policies: stimulus, student debt relief, tariffs, increased child tax credits, limited immigration, and big government deficit spending.

Ourcurrent approach involves identifying possible contact information for thelisted owners and calling multiple numbers, but this process is time-consumingand yields limited results.

If you finance conventionally you don't have that limitation, but you can set your own goal. 

Actually the IRS does not tell us what we can invest in, only what is disallowed (life insurance contracts and collectibles).Allowable investments for SDIRA investing include the following:Residential real estate, including: apartments, single family homes, and duplexesCommercial real estate Undeveloped or raw landREITs (Real Estate Investment Trusts)Real estate notes (mortgages and deeds of trusts)Promissory notes Private limited partnerships, limited liability companies, and C corporationsTax lien certificatesOil and gas investmentsPrivate stock offerings, private placementsJudgments/structured settlementsGold bullion Factoring investments

If OP has not already tried calling every we buy houses ad in the area, they should also do that. 3 days is very limiting though - no time to waste. 

Using cash is great if you want to keep all the profits, but it can limit your deal flow. 

@Kmsuea Abdei signing an Exclusive Buyer Agency Agreement is common, but it can limit you to working with just one agent.

Based on limited information that is provided, I recommend saving longer, since you are unable to house hack.