Hi, Roman!
If you already developed the MVP, first, I’ll suggest to start testing in a “controlled environment” (friendly early users that will check it out and give you feedback). Then you might have a better idea of what features are more important to build on your app soon.
Since you were able to get to the MVP level, then it is better if you build -by your own- the features you mentioned. It will makes you a better bubble developer, understand better your product (critically important at this point), and visualize future needs in the roadmap of your start-up.
If your problem is the UI/UX of the app (how it looks and feels good). Then after you get done with your development, you can hire one of the many agencies around only for that specific purpose, which will be less costly (time & money) than hire anyone to develop, either everything from scratch or taking over your app now.
In addition, when it comes to the templates, I usually recommend to use or buy them, only when you have pretty good level of development by your own. They could frustrate/limit you if you just “don’t get” what the template author intended to do or how you can improve it.
Just to prove my point, Bubble took years to allowed the publications of templates in the ecosystem, since they were scare people will not learn all the potential Bubble itself provides by taking the template-shortcut to accomplish their apps. That old announcement/post should be still around here in the Forum.
Good luck!