There are a few ways to do it in general, I will take it that you are at least aware of some at least but in case -
As someone who trades gold I have found that if you’re doing straight trading from account>account then always use junk (this might not be the case with botting products but could work the same?) which can be anything from a few normal logs all the way to air, fire and law rune
If you’re “logged in” as in manually trading stock over you could also try drop in wildy if you find an empty world (most people do it in edgeville) and don’t have the trade limits
OR you can also purchase auto mulling from someone like @Chris , @Malcolm or one of the fellow scripters of osbot
Hope this helps, but this is just speaking as someone who has done services for years and not tried botting for years, things could and I imagine have changed since my day’s of doing it