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I was wondering if it is possible to offer/upsell products with a subscription option/selling plan on the thank you page after an order has been made.
NVM, can close this.
If you are looking for a clean upsell app then you can try Bundle Upsell & Cross Sell. This is a perfect upsell solution, most importantly it is free to install. You can check this app I think it may help you lot.
If still you are looking for a solution to offer something post purchase,
You can check with this app : https://apps.shopify.com/wizio-post-purchase-upsell
Looks perfect for your requirement.