Every system you try will have flaws, or you may salivate over a feature that appears in other software.Some familiar names are mentioned frequently: Stessa, Apartments.com, RentRedi, TenantCloud, Innago, RentManager, Avail, Rentec Direct, Doorloop, etc.I recommend conducting thorough research on each app online to understand their offerings, pricing, etc.

It appears you can invest in an LLC. 

So, you are no longer a "little guy".Now, let's address your statement that appears to infer that you are "helping people sell who have no other option." 

They give the appearance that they only want to split the rent not there extra fees. 

A PM can appear costly, but nothing is potentially more expensive than contravening LL tenant law.

I became interested in real estate investing starting in 2023, but was discouraged with high-valuations and what appeared to be a tight housing market in Findlay.

City of San Diego initially was going to opt in, but the backlash was significant enough that it appears it is not happening any time soon. 

See Renofi as a potential avenue which appears to be geared towards homeowners looking for renovation funding.

Life isn't as sweet as it appears.

Now, if your area has many str's and that is relatively common, than you may have a reasonable argument.I had somewhat of the opposite issue, where I turned my ltr into a legally permitted str, but unfortunately, there were a ton more unpermitted str's in the area which appeared to dilute the str business.