Trader on appropriate platforms.

When trading, I only use Steam offers for other CS2 Skins/TF2 Keys.
When cash trading, direct trade is the most convenient I don't utilize third-party sites for some reasons.

Why is your inventory sometimes private?
It's private due to trackers and trade bots. I have encountered countless bot spam adding or offering.
If someone is genuine about an offer, I will just easily set it to public.