If you wish to find traders or sellers that have those you need, go to the individual card page and click on Mentions just below the back image. There you will see all those here who have that particular card for trade. By clicking on the link to their ID, you can explore their collection/For Trade list to see if they have more cards from that set that you need and if so, possibly message him for a trade. I would check the member's last log in date before messaging though as some have not logged in for months or years.
If you at least enter those you need into your want list, you can do a trade matching with the member to see if he has any more that you need which would be the fastest way to see potential cards being available from the one member.
By doing this for several cards and several members, you might get to complete your set here on TCDb.
Bruno
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Check my Profile page to see my 2023 Goals and my Lists of sets near completion (5 cards or less) or sets getting close (less than 100 cards missing and 75% complete).
https://www.tcdb.com/Forum.cfm/Page/B/ID/0/?MODE=VIEW&ThreadID=25745&C=0