If you check the date on many of the trades that are getting these offers/views/bookmarks, then you will see that they are fairly older trades. Make sure you are using the "bump trade" feature, so that your trade can be, well, bumped. Other then that, all I can say is be patient like you said above.

I took a look at your trades, because there are often overlooked things which turn people way. What I noticed is you have 2 trades for "collector level" items, which most people don't care about. There are a handful of people looking for those levels, but a lot more selling than buying, so if you want to squeeze anything beyond the regular price out of them you'll be waiting a long time. In one of your trades, you insist that you're only selling as a set, further turning away an already scarce demographic who might offer in the first place.

Now if it were me, I'd immediately stop reading and skip over any trade that (a) hypes up a level or craft number, or (b) says anything about selling as a set because I don't expect to get anywhere without paying at least 1.5 times what it's worth. If I were looking for a collection of levels, unless I get some kind of bulk discount from someone who doesn't require items to be sold as a set, I'd buy each item individually. I also usually skip over offers without "buyout" prices because they usually leave you waiting for 2+ months before you ultimately hide your own offer, but that's another matter.

The way I get offers is I set a (fair) price, which I will only honor in keys/metal, and leave the door open for "item overpay". If someone is short of the keys/metal, for an already reasonably-priced item, they're going to try and offer items and probably overpay in return for accommodating them. Metal/key offers only really work with new/unpriced items, or items that are rare for whatever reason (like a special craft number or themed, unpriced unusual). If you're dealing with fairly common items that already have an established price, people will ignore you when you ask for offers, and maybe someone will come along and cheekily lowball for it.

Your other trade, the chemistry set, is something that's new, and from what I can tell saturating the market. Can't say I've bought/sold any yet, but I've already seen some people selling the strangifier itself for a key, so I'd venture and guess people looking to buy will not wait around very long.

Thanks guys for the advice! I'll try and change up my trades and bump them often now. Thanks again, especially to lava who took an incredible amount of time and effort to help me out! You're all awesome! :D