How to approach a Cash Buyer?

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Hey everyone. I'm based in Los Angeles and I'm new to wholesaling. I'm finding it hard to build relationships with buyers. I've been sending them deals and getting no response. Is it because of COVID-19? I thought at first it was because my numbers weren't right, but I have a mentor who has been Investing in Real Estate for a while and he told me my numbers we fine. I feel a little discouraged because I know I'm doing things right when it comes to finding deals but the disposition part of my business needs work. 

So far I've only tried pulling buyers lists from propstream and listsource. Then I do a text campaign to the buyers. I've also recently tried and email campaign. Neither of those approaches are producing enough responses and out of the ones who do respond there are almost no follow ups. Have any of you been in this situation before? Any tips?