There are module makers who offer Modules on the prestashop platform. Usable for 1.6.
Can't say if your spending pattern was so prudent due to customization. You are not the client, depending on the product many come over the phone and shops over a small screen look alike.
Don't tell me that you started your business without any funds to promote it?
If you plan a shop and wish to have all for free don't count on extra modules.
Why not using the offer of the team: https://store.thirtybees.com/support of use outside update reprogammers?
Presta 1.7 is a framework centered. Hopefully TB withstands that temptation.