No funnel software, or split-testing software, or tracking software.
I wouldn't waste time creating my own products, no upsells, no downsells.
Instead, I would focus 100% of my time, energy, and whatever money I had... on ONE thing.
An email list. It's the only "sure thing" I can rely on as a marketer. I would urge you to adopt the same belief.
We could all wake up tomorrow to a news report about Facebook closing their advertising platform. Maybe Google follows a week later.
Maybe laws get passed banning paid advertising of any kind online. (Unlikely, I know, but hey, it could happen.)
The only "sure thing" are the assets you own. Those can't be taken from you and they can't be governed (for the most part).
Your email list? That's YOURS. You own it.
You put your blood, sweat, and tears into building it. Ain't nobody gonna rip it outta your hands.