All assets found on this site would allow that use case. However, some licenses found here (CC-BY-SA and GPL) may require you to make the asset available under the same license, e.g. free. Any derivative of assets you found here under such licenses would need to be under the same license when sharing it on the Unity Asset Store, so it is unlikely you could effectively make it a paid asset. Here is a summary of the implications for each license we use in your example scenario:

• ❌GPL 2.0 or GPL 3.0: Using assets under this license would require your derivative to be licensed GPL and would likely require you to share your derivative for free.
• ❌CC-BY-SA 3.0 or CC-BY-SA 4.0: Using assets under this license would require your derivative to be licensed CC-BY-SA and would likely require you to share your derivative for free.
• ✔️CC-BY 3.0 or CC-BY 4.0: Using assets under this license would require you to credit the original author on your derivative's Unity Asset Store download page, and link back to the (free) copy found here on OGA. However, your derivative would not be required to be under the same license and could be a paid product so long as you always keep proper attribution listed wherever the derivative is shared/sold.
• ✔️OGA-BY 3.0 or OGA-BY 4.0: Using assets under this license would require you to credit the original author on your derivative's Unity Asset Store download page, and link back to the (free) copy found here on OGA. However, your derivative would not be required to be under the same license and could be a paid product so long as you always keep proper attribution listed wherever the derivative is shared/sold.
• ✅CC0: Using assets under this license have no requirements. You can share/sell your derivative on the Unity Asset Store, even without providing attribution for the original asset found here on OGA. However, it is always welcome if you choose to provide attribution anyway.