These are all great channels to be visible on. In some cases, depending on the product, I would recommend Google PPC or shopping ads since you have your own website.

Otherwise I would say Facebook or develop/build an Email list to eventually integrate email marketing in to your strategy.

Why Facebook? Their resources and how you can fine tune audiences really allows you to spend your budget in a smart way.

Why Email? Email marketing is the best way to remind people that you're alive and say "Hey, I have something that you might like!" And if they don't buy anything, at least you have them pixeled on your site and you can re-target them.

I'd be happy to discuss more on call. I'm new on Clarity but have over 10 years experience selling and marketing online. I'm offering free calls to help boost my account. https://clarity.fm/morrisshipper/freebie

Thanks!