Build the milestones around being ready for the model to be manufactured and sold
Make more restrictive rules and build the milestones around being ready for the model to be manufactured and sold - there's a lot of 3d only submissions that look amazing, but are not necessarily possible to build or models are made with so many bricks that the set would be really expensive and when topped with IP and royalty for the creator, not many people might decide to actually buy such set. Those builds flood the explore list and make it harder for people who actually build their MOCs that they submit, because it's cheaper and often easier to build in CAD without realising it.
For example, if you reach 1K, you need to have building instructions and parts list submitted and those will be verified by moderators before you can continue gathering supports, or something like that.
Because this potentially causes a situation when someone stops gathering supports at 1K, it might stop showing support count over the 1K - just showing 1K until the requirements for the next milestone stage are met. Also potential window for meeting requirements could be like the initial milestone - 60 days and the creator should not see the amount supporters over 1K until requirements are met and validated.