Buying a house Planning ahead - Daily savings account?

Hi everyone, my name is Sebastian, I am 25 years old and I need your help. Currently, as a single person, I earn 2200 euros net per month, some months are better (due to holidays), but since this is not the rule, I want to plan firmly with 2200 euros. What it's about is that I would like to buy a house in 3-4 years. Good houses are available for around 150,000-180,000 euros (In our region). The reason why I want to buy a property only then is that I still have to pay off a loan (due to an operation), which costs me 200 euros per month and will run out in 24 months. Now my question is, how should I "invest" my current "saved" money of 5000-6000 euros?! Do you have any ideas or suggestions? Professionally, I am subsidized with 40 euros per month for VWL (Vermögenswirksame Leistung), which currently goes towards a Bauspar loan from Schwäbisch Hall. I would really appreciate your ideas, if everything fails, I will put my money (which grows by about 500 euros monthly) into the building savings contract, but I fear that I am on the wrong track there and not doing the right thing?! ps.: Please no suggestions like "invest it in stocks" This is too uncertain for me.

Savings bond for the existing money, [Tagesgeldkonto] for the money that is still being saved.

What are savings bonds?

You invest a certain amount for a certain period. However, you cannot access the money until after the term has expired. In return, you receive higher interest than, for example, on a [Tagesgeldkonto]. And the longer the term, the higher the interest.

Of course, this is not investment advice and if things go badly, the interest rate for the [Tagesgeld] could be twice as high in two years as for the concluded five-year savings bond. ;)

Can you simply save more in a building savings contract? I can't imagine that because of the closing fee. But I’m not familiar with that. You would also need to know more about the building saver!