Trying to upload a 5000-individual GEDCOM to WikiTree is, IMHO, a very bad idea. Once you get the GEDCOM loaded you have to go through EVERY single one of those 5000 with GEDCOMPARE before you can get the ADD button to even put in a single profile from your massive GEDCOM. You would spend MANY hours just going through GEDCOMPARE. Then, any profile you create using GEDCOMPARE is a mess that you have to clean up for it to be useful. If you simply must add your info by uploading a GEDCOM and using GEDCOMPARE, I would strongly recommend only having your GEDCOM include a few generations back from yourself and no more than a couple of hundred individuals. Frankly, I tried adding from GEDCOMPARE--once. I saw the mess I had to clean up and format and decided I'd much rather do manual adds. Oh, yes, it is cumbersome and slow to add one-by-one, but I am so much happier with the results because my purpose here is not to create a massive number of profiles, but to have each and every profile I do add be accurate, well-sourced, and well-formatted and honor my ancestors.