First criticism is that you say you're doing nothing wrong. If you were doing nothing wrong, you'd have results. But that's ok, just be real with yourself and your performance. The performance hasn't been there, so look at what you've been doing and pinpoint the break in the system.
Wholesaling/dealfinding is like any other business... it's just a system that you continuously refine and make better. First let's look at the different steps in wholesaling:
1) List Building - This is where you're pulling the lists of preforeclosures, probates, out of state landlords, divorces, tax delinquent, expired listings, etc. You could also be Second piece of this is skip tracing the data to find the contact information.
2) Sales & Marketing / Lead Generation - This is where you could be doing several things to reach your customers. Usually it boils down to either passive outreach (meaning you pay money and it markets in the background) or active outreach (usually lower cost but takes your time for outreach). Passive methods include but aren't limited to Google PPC, SEO, Direct Mail, TV or Radio Commercials. Active methods include but aren't limited to cold calling, texting, emailing, and door knocking. A healthy mix of both is the best way to pump up your pipeline and lead generation.
3) Contract Conversion - Once you get a lead, it's going to come down to your sales and negotiation skills to find the motivation of the seller, the condition of the property, they're timing, and purchase price. Negotiation skills are outside the scope of this post, but sales is a skill anyone can learn and SHOULD learn. Secondly, you're not going to convert everyone right away, so make sure you have a good follow up system in place to continue your outreach to them.
4) Disposition - Now is where you need to decide if you're going to keep it, assign it, flip it, build on it, or something else. Ask yourself what is the highest and best use of this property, then monetize the lead. Always continue building your buyer's list and your network so you can push up the prices on your deals and get better returns from your marketing dollars.
That's pretty much it. 4 steps to wholesaling/deal finding. Now that you know this, where are you falling short?
Do you have bad lists? Try list stacking, which is where you target people that fall under multiple lists. For example, instead of spending time reaching out to a vacant property, reach out to a vacant property owned by an out of state landlord, who came into this property by probate and is now facing foreclosure. Or maybe you're already list stacking, but you have bad phone numbers so you never connect with homeowners. Try a better skip tracing service. Or maybe its just the total volume of prospects on your list - buy more data.
Maybe it's your marketing. Are you only reaching out to people via direct mail? Maybe you need to try getting in touch with them directly through cold call, texting, or some other method. Open up more funnels that will produce additional leads for you.
Or maybe you're getting people on the phone, having tons of conversations, but just not getting the deals. It might be your sales skills. For example, a cold calling rule of thumb is that per 200 conversations, you might get 20 people say "yes I'm interested in an offer" and half will say "I'm willing to sell at a discount" with 1 person selling at enough of a discount there's room for an assignment fee, flip profit or BRRRR. It's just going to take time. I've been in sales and marketing my entire career, so this step is more natural for me. But there are countless books out there around sales, marketing, negotiation, etc.
Lastly for dispositions, it sounds like we're not even getting to this point so I won't touch on it. But people are looking for deals all over the place right now. If you find a deal, someone will buy it through assignment or partner with you... granted it's actually a good deal. You can find people on BiggerPockets, Facebook, your local market, everywhere. There are investors all over the place.
A word of caution, I don't advise wholesaling unless you have the means to close the deal yourself. The last thing you want is to lock up a contract with an owner in distress only to realize you can't buy it or wholesale it. Wholesaling is in desperate need of regulation, so just be ready to close the deal once you get one.