A reset is not deletion
A submission allowance counts incoming responses over a period. Storage measures retained data. A monthly reset of one does not establish a monthly reset of the other.
Read scope before multiplying anything. A limit for an account or workspace does not become a per-form allowance just because you create more forms. If the scope or allocation is unknown, a precise capacity conclusion is unavailable.
Estimate the workload you will retain
Use current form data plus monthly submissions × average files per submission × average file size × retention months. The maximum individual file determines whether one response can be accepted; the average is an explicit assumption for retained volume.
Keep those inputs visible. They are not a measured prediction, and changing retention can substantially change the estimate. Finder lets you enter them under the advanced conditions.
Shared space needs two checks
Holding an existing account may affect incremental cost. It does not prove that the account has usable free space. Compare the workload with both the verified applicable plan capacity and the allocation you actually have available. A larger self-reported allocation cannot raise a smaller verified cap.
Fair-use language is a condition, not an infinite number. Likewise an excess-use price alone does not grant permission to exceed an included allowance. Permission, a hard cap, a fee threshold and a fee rate are distinct facts.
Read the current scope carefully
Google Forms documents a cumulative per-form response limit. Assess monthly volume separately. Tally fair-use examples give thresholds for checking with the provider. Guaranteed stored-file capacity remains unverified.