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Hello, if i want to upgrade to HDRP and i already have custom shaders and i cant use the HDRP Shader, What should i do?

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A reasonable solution #1 is don’t upgrade. Considering HDRP’s primary gain is (much) better shaders/shader architecture, if you’re not going to use them, what’s the point in upgrading?

Solution #2 is convert your materials to use HDRP/Lit etc., for which it has a handy tool. You might be able to use it if, for example, you’re using a bespoke uber shader if you just select all your materials, swap it to standard, then run the conversion tool in HDRP. This will work if you’re aiming for visual realism and the problem is your current shaders are a halfway house between vanilla and HDRP.

If you mean you have a load of custom, incompatible shaders doing crazy FX, then rewriting them or googling in the hopes of an equivalent is the only way to go. There are many common cases (e.g. particles) where they’re not in the box but easy to find/download and tweak in ShaderLab without needing a lot of programming knowledge.