With 3 unpaid item strikes, you're pretty much extremely limited as most sellers have set their buyer requirements to automatically block bidders with 2 or more unpaid item strikes in the past 12 months.
You can try to appeal the strikes. Ebay may forgive one strike but I doubt they will remove all three.
Since some sellers do not have the block in place, you will just have to find those sellers.
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Non payers should get unpaid item strikes and be added to block bidders lists. Period.