Why not design primers to make 2-3 pieces and clone them using Gibson Assembly? I assume that your final goal is to clone into an expression vector. Besides, my answers might be more helpful if you are more specific about the gene (GC-content...).
Use gene specific primers and 3-5 reverse primers at around 1-2 kb each to get long cDNA fragments after RT-PCR and then use specific homology primers to join the fragments using as previously mentioned Gibson/Hi-fi assembly kits or overlap extension PCRs. Also note use of gene specific primers you can sometimes get upto 2 Kbp amplicons.
Also check the GC content of your amplicon, if it's very high your best bet would be to get it synthesized from GenScript or other gene synthesis companies.
What polymerase are you using? You can get some brands that are designed for longer sequences eg. Herculase.
Using some additional primers with shorter amplicons to verify your primers are working would be useful.
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