I owe you a virtual pint! 

Does advanced marketing (virtual tours, online bidding, etc) result in more offers? 

The parts cost virtually nothing; the labor getting to the line can be big, depending on how deep it is.

Visit local REI groups, live and virtual.

As wholesaler, you should know you need to spend at least $20K of your own money with Day-Glo signs, cheesy letters in hand-scrawl saying how honest you are and hiring some virtual agents in Vladivostok to make really cold calls on your behalf.At least those are what I hear other wholesalers doing.You might want to consider getting a legitimate RE license and then listing it for a commission.  

I would also suggest trying to find a mentor, whether that be somebody you meet organically through local/virtual meetups or a paid mentorship.

Try local facebook groups and networking on the virtual REIA's going on right now.Just my thoughts

In other words, they want to know that the income brought in from rent will cover the mortgage.Finding a triplex/quad that is self-sustaining in San Diego, that meets the FHA expectations on condition, is virtually impossible. 

We're all virtual right now and there are plenty of groups doing the same

Many meetups are virtual right now.