Ive been looking for cheaper alternatives to Unbounce but none seem to provide the same functionalities and ease of use. Have you used Hubspot landing pages with same effect? It seems that it lacks customization

Have you looked at Go High Level? It seems to be working for several of my agency friends - and can support email, text, courses, etc. (I don’t use it in my business, but have worked with it for clients.)

hmm this is orientated towards agencies, I am from a startup that I will pretty much do all the things solo

It is geared toward agencies, and I have 2 or 3 clients that are not agencies and have been very happy with it. Likely just depends on use-case specifics - which functions are most important to you and such.